is the APS TT is sensitive as the APS ST to the back pressure ?

can I run hi flow metal cat converters with APS TT ? or do I must run the APS exhaust sytem with test pipes for the TT kit as the APS ST ?

thanks for the info !

I appreciated !

 

Wouldn't try it... Internal wg setup on the TT isn't as picky as the ST, but in any case, it's still not the best idea to introduce a cat after the turbos. They just don't play nice together.

 

Chances are you will burn up the cats in less then a year, unless you get the Unichip retuned for each season or get a nice standalone EMU that can keep the car from allowing too much unburnt gas into the cats. You can run any test pipe and exhaust you want but a larger exhaust will help alot in reducing backpressure on the TT wastegates.

 

Don't bother with cats unless you have really strict emission laws in your area. Go with test pipes and a true dual exhaust.

 

ok, thanks !

and what about tests pipes and my 3" free flow cat back Vibrant ? sounds good ?

 

and...

 

....I wouldn't call a single 3" a "free flow" exhaust. Get at least an APS 2.5" or Greddy TT exhaust.

Technically you can do whatever you want, but if you want the best results, run test pipes with a decent 2.5" dual or larger exhaust.

 

hummm... maybe you are right...

for me a free flow exhaust system is a cat converter free system and a free flow silencer, I mean without baffles...

but for sure, a dual 2,5" exhaust system is less retrictive than a single 3"... but I'm not sur if I will have many more hp with a APS TT at 8-9 psi...

 

it isn't necessarily about the HP. It is also about the thermal load on the motor due to restrictive exhaust. That equates to reliability and longevity.

If you are going to spend 7500 + install + tune + clutch + gauges, why would you skip out and run a less than ideal exhaust setup?

 

the aps is the safest way to go but the rule of thumb is don't get something that will restrict the turbos....(cats)