Bought a t1r 63mm, but the retailer forget to order one for me. So they are sending me the 70 mm with test pipe for the same price as the 63mm. Question is, will I lose anything on the bottom end by going to a bigger exhuast. Motor is all stock except for aem cai and jg eldebrock intake.

 

Is it possible, yes. Will you, only a dyno could tell. Bring both your stock and T1R exhaust with you to the tuner, only take a few minutes to change them.

 

You're getting a heck of a deal

The 70mm is probably the best N/A exhaust you can get your hands on.

I doubt you will loose anything down low, I've never seen a dyno where someone looses power anywhere by going big.

The 70mm T1R is loud though, I should know