Originally Posted by VABAM

My

Test pipes will open up your exhaust and increase flow = more power and sound. I have never heard of the 3 mods thing. I have 4, no tune, no CELs, no issues, no worries. (Stillen Gen3 CAI, Motordyne M370 manifold, Motordyne ART test pipes, Stillen CBE) Now a tune will get the most out of your mods but no tune shouldn't hurt anything. The ECU with the stock tune will adjust a little to the mods.