I am afraid that I may be on the path to creating a slight bottleneck in the exhaust system and giving way to boost/exhaust turbulence.

Heres the setup that is most likely going in:

- 3" WORKS O2 Housing
- 3" WORKS Downpipe
- 3" Helix High Flow Cat
- 2.95" HKS Hi-Power Exhaust (which tapers as it approaches the cat)

As you can see, I am going from a 3" exhaust at the O2 sensor all they way into a tapered 2.95" cat-back. What do you guys think?

 

3% difference in area. no big deal.

 

okay good, i just wanted to be extremely careful in putting together an exhaust system.

what is your opinion on the quality of WORKS products?

 

it wont make a BIG noticable difference, but it will make or show a difference of a low gain in a dyno graph on TQ or HP curves in higher RPM levels

 

it gets to 2 1/2'' not 2 95 where it meet the cat i have the same sh-t

 

oh, so this is actually a good thing?

thanks for the feedback joel.

 

Don't see too much problem as many aftermarket 3" systems neck down slightly at the cat. The bigger issue, if I may, is why not stick with WORKS when you already spent good money on two of their products? I love the WORKS DP and the HFC and I am not bashing HKS, but if you are spending that much for WORKS, why not make it a system?

 

good thing - no - I rather have more top end than low-end - thats why I opt for 3" all the way. Even David Buschur from Buschur Racing recommends it

 

Piping is piping - one is not made out of gold or chocolate - both will gave almost the same HP - its just all in the tuning

 

maybe not a good thing for you, but i love a little bit of torque down low to compensate for the high end power.

 

i already have an hks hi-power that is going in after february. i love the sound these exhausts produce and the quality/craftsmanship behind them.

not sure about the WORKS HFC. i've seen the helix and i am very, very impressed. guess that remains to be determined.

the main reason i'm going with the WORKS downpipe is because its the only 3" on the market that doesnt interfere with the lower tie bars or the oil pan. (i think)

 

only turbulance you should be worrying about on a turbo car is the intake to intake manifold.

you could get a erratic a/f reading which somehow could lean your car out at some point in your rpm.

don't worry about the exhaust, our car don't depend on back pressure that much.