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Old 07-17-2017, 08:53 PM   #26
gross polluter
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Awesome thread, askhole.
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Old 07-17-2017, 08:57 PM   #27
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I'm sorry I'm not trying to be an askhole. I just feel like a hoodpipe is the only thing I can afford right now and I was simply wondering what would be the best approach.
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Old 07-18-2017, 07:33 AM   #28
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Don't worry about anyone's opinions, they are entitled to make them. Just do you, 'Full tilt diva' the **** out of it! lol.
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Old 07-18-2017, 07:35 AM   #29
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That piece is nice! great work.


Quote:
Originally Posted by EivlEvo View Post
It will be over 96dbz.

1. I ran the wastegate on my Evo external dump (though... not out the hood because I think it's ridiculous ESPECIALLY if you're trying to save money) this is mine actually lol

It sounded GREAT until WOT. It sounded like a McLaren Mercedes as the WG was flapping about... after that, it sounded like tractor. It was also WAY too loud. And that's with a turbo in the way.

2. I ran the Volvo with both "some" exhaust and "no" exhaust. While I generally like the tractor motor sound it makes, and with the "some" exhaust once you got onto the revs you could definitely hear the neat grpA sounds (regardless of how different the motor is) it was LOUD. Like... you won't be able to have a conversation loud. This was with no turbo.

3. I ran turbo and downpipe (15g) and it was quiet enough, but it sounded like a semi truck. Too whistley. I added a HF cat and a muffler (straight through) and exited out the side and it sounds quite good now... but it's definitely too quiet. I'll probably experiment with some other choices.


Toxicfab also makes that O2 housing in a hood dump. Cutting a hole in your hood to save money is like fighting for peace or screwing for virginity. You can run it down and have the same exact thing. But my real point is... it will be loud. Unless I'm missing something silly.

You also need a plan for water.
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Old 07-18-2017, 07:36 AM   #30
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Quote:
Originally Posted by Wren View Post
FTFY
lol, Thanks.
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Old 07-18-2017, 12:18 PM   #31
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That piece is nice! great work.
Heh... it's not mine. It's toxicfab... it's all super nice. I have one of his manifolds on my Evo now.

Regarding getting pulled over... don't be foolish. Cops pull people over for anything. Including but not limited to whatever they feel they can fit into the definition of probable cause. I'll say this. I felt like I was able to get away with a LOT more loud exhaust crap in the Volvo because the cops probably just assumed it was some pile of crap. If you have a pipe coming out of your hood... flush or not you're going to get noticed. Especially if you're driving like a jackass (queue the classic teen response of... I never do that, and then queue the classic adult response of... then why does it matter so much to put a pipe through your hood).

Obviously your mind is made up. You're completely correct... you might not get pulled over... but if you do it's going to become a problem.

Regarding your turbo build... read more. Be conservative with boost to start. You have skinny rod motor and youthful indiscretion. Try not to die.

Re gross polluter... ignore them... they say that in pretty much every post that doesn't meet their standards.
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Old 07-18-2017, 12:27 PM   #32
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build a normal downpipe, run it open for a few weeks and hate life, run the rest of the exhaust.

hood exit is loud AF. open downpipe under the car is loud AF.

You will get a lot of attention, and you will get pulled over.
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Old 07-18-2017, 02:25 PM   #33
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Well considering everyone's concern, I'm genuinely considering picking up one of those $50 Ebay butterfly valves and some how setting it up so I can choose between a muffled downpipe (not built all the way back) and a hoodpipe. The only problem is I cant seem to find a valve that switches between two pipes, they are all just open or closed (meaning I would need 2 to actually switch between exhaust options). Also I'd have to find a place to put the O2 sensor bung so that it works for either configuration. Anyone ever done anything similar?
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Old 07-18-2017, 02:39 PM   #34
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Quote:
Originally Posted by maxitoman007 View Post
Well considering everyone's concern, I'm genuinely considering picking up one of those $50 Ebay butterfly valves and some how setting it up so I can choose between a muffled downpipe (not built all the way back) and a hoodpipe. The only problem is I cant seem to find a valve that switches between two pipes, they are all just open or closed (meaning I would need 2 to actually switch between exhaust options). Also I'd have to find a place to put the O2 sensor bung so that it works for either configuration. Anyone ever done anything similar?
really? After the beating you're taking in this thread, you're asking if anyone here has ever done something similar to an even crazier idea you just had?

The answer is no, and please...build an exhaust or run an open dump facing downwards. There's absolutely NO reason to cut a hole in the hood, except for a futile attempt at what passes for 'street cred' now...thanks to a million stupid ricer youtube channels.
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Old 07-18-2017, 03:01 PM   #35
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Guys please understand that this is not for "street cred" its for saving money, that's it and that's all.
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Old 07-18-2017, 03:13 PM   #36
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Just not touching it would save you more money.
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Old 07-18-2017, 03:21 PM   #37
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Quote:
Originally Posted by maxitoman007 View Post
Guys please understand that this is not for "street cred" its for saving money, that's it and that's all.
No. It isn't for saving money. Because turning it down is less linear feet of pipe than up and could be easily used as the front of a downpipe later.

That's why people are flaming you. There is no argument you can make that cutting a hole in your hood was the cheapest option. It's not. You're doing this because you want to see fire shoot out of your hood. Fine. But don't be a rube and talk about it saves money blah blah blah.
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Old 07-18-2017, 03:28 PM   #38
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Quote:
Originally Posted by maxitoman007 View Post
Guys please understand that this is not for "street cred" its for saving money, that's it and that's all.
Any half decent exhaust shop will weld up a side pipe for you for probably less than $100. As a bonus, you get to keep your hood.
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Old 07-18-2017, 04:18 PM   #39
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Oh I didn't realize it was the same amount of piping. I thought it would be much longer to do a downpipe. Will there be a big difference between a 3" open downpipe and a 2.5" ? I have much better access to 2.5" at the moment but I'll work out how to get 3" if it shows significant performance gains.
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Old 07-18-2017, 04:23 PM   #40
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Quote:
Originally Posted by maxitoman007 View Post
Guys please understand that this is not for "street cred" its for saving money, that's it and that's all.
I learned this lesson a looooooong time ago: If you can't afford to do it right, don't do it.

A hood pipe is far from the best/cheapest answer. If you're hell bent on an open exhaust, get a 90* mandrel bend, the same bend you'd use to make the hood pipe, and point it down instead of up. That way, you'll still have the extreme loudness, and will only get pulled over for noise violations and not safety/emissions violations.

A 3" open vs. a 2.5" open isn't a big deal, IMO. I'd go with the cheaper of the two, depending on what they charge to adapt the piping to the turbo.
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Old 07-18-2017, 05:21 PM   #41
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the OE downpipe is just about 2.5 inches, and not a bad piece. would suggest looking elsewhere/waiting.
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Old 07-19-2017, 05:34 AM   #42
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Quote:
Originally Posted by Broke4speed View Post
I learned this lesson a looooooong time ago: If you can't afford to do it right, don't do it.

A hood pipe is far from the best/cheapest answer. If you're hell bent on an open exhaust, get a 90* mandrel bend, the same bend you'd use to make the hood pipe, and point it down instead of up. That way, you'll still have the extreme loudness, and will only get pulled over for noise violations and not safety/emissions violations.

A 3" open vs. a 2.5" open isn't a big deal, IMO. I'd go with the cheaper of the two, depending on what they charge to adapt the piping to the turbo.
THIS.
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Old 07-19-2017, 10:17 AM   #43
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but.. but... hoodpipe... !!!
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Old 07-19-2017, 10:27 AM   #44
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Quote:
Originally Posted by maxitoman007 View Post
Oh I didn't realize it was the same amount of piping. I thought it would be much longer to do a downpipe. Will there be a big difference between a 3" open downpipe and a 2.5" ? I have much better access to 2.5" at the moment but I'll work out how to get 3" if it shows significant performance gains.
To do a FULL downpipe makes kind of a square Z shape. To do a simple turn down is just the same as pointing up out of the hood or down at the ground. If you aim it down, WHEN you realize you don't like it... you can just tack the back pieces on and you have your downpipe whereas if it goes out the hood, you have to cut re-weld and then figure out how to address the hole in your hood.

Regarding the 2.5 vs 3. Depending on what turbo you go with... it will make a difference. I believe that Volvo used metric spec piping and the stock turbo exhaust was 60mm (don't quote me on that). IPD turbo exhaust is 2.5 I believe. Most of us are running 3" pipe for our exhaust I believe.

With such a short pipe, I don't think you'll see any gains from one over the other... but 3" is probably more ideal long run.

If you use a Volvo turbo with a conical flange, you'll need the cone part first anyhow.
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Old 07-20-2017, 02:11 AM   #45
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Well my turbo has a 2.5 inch 4 bolt outlet if that helps.
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Old 07-20-2017, 06:41 AM   #46
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buy a chemical mask
https://globalbiodefense.com/wp-cont...cbrn_mask2.jpg

build a short pipe into the cabin of your car and you won't have probs with noise /96db

and you look cool dude

my two cents

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Old 07-21-2017, 07:34 PM   #47
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Lol
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Old 07-21-2017, 08:06 PM   #48
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Just cut a hole in the fire wall and run it strait off the turbo into the cabin
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Old 07-21-2017, 08:48 PM   #49
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The passenger can roast marshmallows on the flames coming out haha.
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Old 07-22-2017, 09:12 AM   #50
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Quote:
Originally Posted by Stiggy Pop View Post
if any car has a stupid pipe coming out of the hood, or front fender, it better make 800+ hp
This.
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