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silver m6
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240 Posts
Discussion Starter · #1 ·
I have a SLP longtubes with high flow cats. I just picked up O2 sims. I just need to pick up some stainless pipes to put in the cat area. And I picked up the O2 bungs also. I was just wondering if I would need to retune the car. I just had the car tuned and do not want to have to go thru that again. I figure I would pick up a little more horsepower also. Please give me your opinion.
 

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burnout silver star award :)
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if your car is close to stock you are not going to see much of a hp difference. would you see a benefit from a retune, yes. is it needed, no. now you need to get a intake :)
 

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burnout silver star award :)
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at this point i would say your restiction is your stock catback not the cats.
 
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