Quote:
Originally Posted by Adam@Riss Racing
The flow characteristics with 3" flow will be much more different than 2.5" throughout. I've heard of some turbo Volvo race cars that had 4" downpipes which continually taper down to 2.5" making about 30% more power than 3" throughout. Gains on a stock car were around 30whp. Tuned, you'll see around 60whp bump with a downpipe map.
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Hey Adam. Thanks for answering my questions here and on the other forum. I've heard nothing but good info about your products.
Is there any technical info anywhere on why what you stated is true? I've heard on different forums that the taper helps, but never why. I'm certainly down for getting a set when I finish the break-in on my new 135i when it comes. I'm just curies about the science behind it.
Thanks again. :thumbup: