Fender exit exhaust
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Joined: Apr 2009
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From: Joliet,IL and Las Vegas 50/50
I have a 4" dp through the bmr kmember with a cutout then tapered down to the 3" magnaflow catback exhaust. Having a fender exit exhaust is what all the cool kids are doing, but dragging tips is fun too. 
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Fender exits obviously work out best for turbo cars, but like subhuman's car, you can do it without also. I chose a fender exit on my car, because previously I had an issue with a full length exhaust's backpressure limiting hp on my car. So this next build I wanted the free-ist flowing exhaust I could do, and no backpressure, so I did a 4" downpipe out the fender. It has obviously been working well for me.
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Joined: Mar 2014
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I wood love to see back to back comparisons on a set of those against a set of 2" Kooks long tubes on a flow bench and then on a dyno to see the difference. Just seems like with all those weld joints and bends they surely can't be balanced to flow evenly. The turbo cars I get it. But N/A cars not so much. It does look really cool. Just curious as to what it will do performance wise.
I wood love to see back to back comparisons on a set of those against a set of 2" Kooks long tubes on a flow bench and then on a dyno to see the difference. Just seems like with all those weld joints and bends they surely can't be balanced to flow evenly. The turbo cars I get it. But N/A cars not so much. It does look really cool. Just curious as to what it will do performance wise.
My headers were basically fitting 20lbs of **** into a 1 lb bag.... but being a nitrous engine, its not a huge factor... on an all out nitrous engine its more important to get the exhaust out than a tuned length.