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Old 10-30-2016, 09:59 PM   #1
Varinn
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Join Date: Apr 2010
Location: Vancouver
Posts: 758
S52 exhaust

I've been down this road a few times before. I'm looking to build an exhaust for hopefully the last time on my S52 e30.

What is the ideal size for a stock motor with m50 manifold? I'll be upgrading to Schrick 256/264 cams and either Jenvey ITB's or an Eaton M90 in the next year.

Thinking to install raceland longtube headers (I know they are hard to fit, but I've seen the issues and know how to deal with it), dual 2.25" merged to a single 2.75" at the first muffler and carrying that size through to the back. Mufflers would be a 2.75" single vibrant/magnaflow and a 3" vibrant streetpower with dual 3.5" outlets at the very back. The car is going to be turned into a street legal trackday car so I'm aiming to maximize power throughout the range while keeping noise down below our 90dB limit.

Layout wise would look similar to this but with a second muffler in the stock e30 cat location to keep noise down.

I'm a fairly competent tig welder with stainless and have plans to buy mandrel bends to cut and make them fit as nice as possible.

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