How to prevent "BACK FIRING"?

[NisanS13turbo]

My car backfires sometimes on first and second gear and usaully happens when i shift to the next gear. What could be the problem and what can i do? Thanks guys

MODS:3' catback exhaust if that helps.

[navysnail]

its running rich, plus the exhaust doesnt "hide" the backfiring like the stock system.

if you really want to hear somthing, listen to race cars when they shift.

[240sx2nr]

only in first and second? could be a bad diverter valve...

[DawgMode]

but what is wrong if your car back fires when downshifting

[nothingFancy]

its no bigie, my car backfires all the time. car is fine, just to much exhuast on a stock motor

[crzycav86]

Backfire is perfectly natural on all engines. You just don't hear it with the stock exhaust, but it happens... I think it sounds cool anyway.