alrite guys...i just got a brand new Greddy TI-C catback for my 07 civic coupe....it sounds great..loud and deep...

so here is the problem

everytime i shift down from 4th to 3rd @ 1500RPM the exhuast makes 2-3 poping noise...its NOT aLOUD popping sound..it sounds like firecrackers.. or those thing u throw againist the ground and it makes a "popping" noise...i think its call popper?

anyways

is it normal for the exhuast to make popping noise while shifting down?

it only does it when i shift down...

 

try not waiting so long to downshift. downshift at like 2000-2200 rpms and see what it does. might just be your waiting to down shift to late.

 

Its possible its a bit bogging out, the TI-C I think is a pretty big and wide exhaust system...so when you downshift at 1500k it might bog out for a second, try shifting at 2500k or 3000k to 4th, then wait and downshift to 3rd