I appologize before hand if I put this forum in the wrong place.

I have a HKS Turbo Downpipe, Straight pipe, Legamax Exhaust on my X

I'm looking to get a test pipe to replace my cat. but I am worried about not enough back pressure from the engine if i just run a straight pipe all the way back.

has anyone installed a test pipe with a full exhaust system through HKS?
should i not worry about it? or is there other things i should consider/get before purchasing a test pipe?

Any feedback would be greatly appreciated, thank you.

 

You don't need back pressure for a turbocharged car.

 

You want the least amount of back pressure as possible with a turbo car.

 

Another answer is:

The turbo will supply more than enough back pressure for the engine. The turbo needs 0 back pressure.

 

i have a downpipe test pipe and a hks catback. my car drives fine!

 

+1

The one and only piece of the exhaust system that will make all the difference is the test pipe! well, it's the most restrictive part anyways!

 

the lack of back pressure affects boost control tuning more than anything else