put in a new catback this week (same size and all, just diff brand to make quieter)

now someone told me I need a new tune. i cant understand why, since both catbacks were 3", so nothing changed. but they say since i relocated the O2 sensor, and since this catback has different resonators inside, the flow of the exhaust changed significantly enough that i need a new tune to make the car run smooth. i hope this isnt true. what do you think ??

 

wait until you do a few more mods for a retune. it will be a waste of a few hundred dollars for a gain of a few horsepower

 

I say quit listening to that someone......its fine.

 

if u tune ur car do it,u will enjoy the slight gain of power!
but if ur planing to pay for a tune wait to get more boltons to be worth the money and the power!
cheers

 

gains from the exhaust, i bet you wont even feel the difference. just leave it as it is.

 

i think i didnt explain the situation properly. i already have a good tune. and all the bolts-ons. i had a full 3" catback (with no cat). the car made 348awhp/336. all i did now was i swapped my previous catback for a diff brand catback (just to make it quieter - btw, im selling my previous catback - TurboXS 3" with Ti tip).

so now the Q, do i need a new tune, simply b/c i changed the catback ? ?

 

No, you don't.

 

No.