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Old 05-27-2019, 10:39 PM   #1
vwbusman66
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Default 140 exhaust size choice

Need to build an exhaust system for the 142
I have 10' of 3" pipe and clamps as well as a muffler already. Will this be OK? I know its wicked overkill and will probably hurt performance due to the total absence of backpressure.
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Old 05-28-2019, 07:37 AM   #2
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I would say too big for a stock B20.
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Old 05-28-2019, 09:01 AM   #3
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It's too big. But there is no performance advantage to a smaller exhaust system.

There are tuning effects of the exhaust manifold/header/merge styles and distances and tubing diameters. But after all that, all the rest of the exhaust system needs to do is stay out of the way.

Since you have it, might as well? 2.25 or 2.5 is probably about all a heated up B20 would ever need.
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Old 05-28-2019, 09:10 AM   #4
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Why stop at 3"?
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Old 05-28-2019, 02:34 PM   #5
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Why stop at 3"?
why does he need 10 feet when routing it up through the hood only takes maybe 1.5
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Old 05-28-2019, 03:00 PM   #6
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Too big
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Old 05-28-2019, 04:20 PM   #7
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why does he need 10 feet when routing it up through the hood only takes maybe 1.5
Why even pipe, just flip the header, use some spacers to clear the carbs. theyre almost symmetrical anyway.
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Old 05-28-2019, 04:21 PM   #8
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Too big


It'll nevar spewl.
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how psi stock cna support?

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Old 05-28-2019, 04:29 PM   #9
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Why even pipe, just flip the header, use some spacers to clear the carbs. theyre almost symmetrical anyway.
good point or route 4 inch into the passenger compartment
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Old 05-28-2019, 04:41 PM   #10
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Just get the 2" sport system from VP and be done with it.

http://212.247.61.152/US/main.aspx?p...cle&artno=071K
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Old 05-28-2019, 06:20 PM   #11
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Just get the 2" sport system from VP and be done with it.

http://212.247.61.152/US/main.aspx?p...cle&artno=071K
That's too good of an idea.

OP doesn't want $22 of steel pipe to go to waste.
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Old 05-28-2019, 08:08 PM   #12
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That's too good of an idea.

OP doesn't want $22 of steel pipe to go to waste.
Correct
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Old 05-28-2019, 08:48 PM   #13
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Correct


Sell it on here to somebody with a Turbo car for $14.99.
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Old 05-30-2019, 04:56 PM   #14
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A good first step is a 142E exhaust, but building is more fun. I say 2.5" straight off the joining from the manifold into a 2 chamber, Flowmaster. No restriction. Lots of noise. Terrible at low RPM with a cam with a lot of overlap.

It also confused a cop hearing the car coming, seeing a yellow 145 with white (fiberglass fenders and cage) slide through a left at the end of an off ramp. He just shook his head and pretended not to see anything.
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Old 05-30-2019, 09:44 PM   #15
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I used 2" system on my 123gt. Bought a 142E front pipe. Then had a local shop make up the rest with only one muffler. Had a nice bark to it and was in the affordable zone. I think it was a couple hundred?
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Old 06-06-2019, 03:19 PM   #16
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Simons Sport system, 2" is fine if you don't mind quiet performance at a reasonable price. Otherwise, 2.25" is fine. If you are doing head work, bigger camshaft, more compression, more fuel, you might benefit from 2.5". The larger you go, the louder it'll be with no help to anything else but more weight.
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Old 06-06-2019, 03:51 PM   #17
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Op went with 6" twin freightliner stacks instead
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Old 06-06-2019, 04:32 PM   #18
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SWEET! Pics or ban!
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Old 06-06-2019, 05:52 PM   #19
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For a mild B20 2.25 is about the ideal size. For a well worked B20 then you will likely want 2.5 inch

Going too bit will loose you low and mid range power
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