Well I'm moving to a different part of New Mexico and they don't require emissions tests. I have the Vortech SC and was wondering what pipes to go with my Nismo exhaust and will I have to retune once they are on? Will I have any issues with backpressure that i supossedly need to attain proper boost? Thanks for any help.

 

Some Kinteix cats
some some good Headers

 

I have Nismo catback exhaust and stillen headers as is. I also have the Kinetix SSV manifold. I was wondering if the next step would be to lose the cats or a highflow cat or test pipes? Will I need a retune after adding them?

 

As far as backpressure is concerned, you should not loose power although you'll be making less boost with the same pulley... You will need a tune after adding test pipes or HFC. They change your A/F drastically and unpredictably. I went really rich after i put test pipes on, only for the computer to lean it out after a few months.

 

So would you go with HFC or test pipes or leave it as is?

 

Any thoughts?

 

Test pipes all the way.

 

how much more of a gain will you get from test pipes than high flow cats? and is the raspiness worth it? I've heard that even the resonateed ones are a bit raspy.