Quote:
Originally Posted by Raimund
This dyno that Chilledn52 posted is not of my car, but a stock exhaust 328i with just the velocity stacks. The stock manifolds are choking it up top.
Here in this photo you can see my run with headers in red added in and how it pulls ahead in the top end.
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Thank you! I'm thinking about 15whp more with similar setups - plus a broader powerband. Is this open trumpets, or filters?