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Old 01-16-2021, 07:58 PM   #3
Join Date: Jan 2021

Originally Posted by Jussi Alanko View Post
Holset hx40 super, with 18cm2 exhaust housing, works at 350->650hp...
Wakes up early with GOOD tubular equal lenght twin-scroll exhaust manifold.

Or a hx35super, good for 300-500hp.
Thank you! I will check that out. With the hx35super, does that bolt onto a stock manifold?

Also - unrelated, but hopefully you might know. I see 531 heads available online, but they're advertised as being previously used on freshwater marine engines. Are those the 8v heads that people swap onto the B230?
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