Quote:
Originally Posted by fastyz400  After taking a look at the stock downpipe, I didn't see that much restrictions as far as bends or kinks.
Can someone explain why a aftermarket down pipe is better?
Wouldn't a high flow cat in the place of the factory cat have the same effect? |
the factory exhaust system its self is a full 3", but it does has lots of restrictions. first the d/p: even though its 3" it has a very harsh 90 degree bend right at the top where the exhaust flow first enters it. this totally goes against performance where exhausts are supposed to be as free flow as possible. second the cat isnt a high flow one but its not the worst either. third is the factory exhaust has 10 bends in it
, and then youve got that gigantic muffler in the back. the suit case in the back is not only a restriction by being a muffler but its design is bad too. it has no baffles or flow directors in it so the exhaust just kinda bounces around in it and creates a lot of turbulence. so there you go thats pretty much all the main issues with the stock tbe.
compare that to the tbe i have on my car that has a smooth gradual bend off the turbo with no cat (my choice highflow will work fine too) only 4 mandrel bends so it keeps its 3" diameter even through the bends, instead of 10 like the stocker, and no suit case in back. and you can see that even though the factory exhaust is 3" its has tons of restrictions. and the down pipe with the 90 in it is one of the biggest.