i'm wondering which is better high flow cats or test pipes which would you go with?

I heard test pipes are better for FI car cause on a NA car the test pipes might loose HP because of no back pressure is this true?

what would you go with High Flow cats or test pipes I already have DC headers and ordered an HKS true dual exhaust so now i need either one.

Please input

thanks
Gilbert

 

High flow. Less resp. and stinks less.

 

I have the Kinetix HF cats. I'm very happy w/performance & sound, plus in Calif. smog emission tests are an issue.

I hope to see you around Chino (CA). I'm have a Red G35 Coupe w/Volk SF Challenges Diamond Black in 19".

 

I'd say Helix or Crawford HF Cats...

 

great thanks guys hope to see you too mine is red but mostly performance mods than looks so it looks stock from the outside