Heartless

Just installed jethot LT on 02 SS with A4. running duals dumped at axle with 4 inch round by 18 magnaflow bullets on each side. (no crossover).... when hitting wot and A4 winding up, when tranny shifts I am getting what sounds like a backfire, or for lack of a better description a loud "cough" thru exhaust. installed new ngk iridiums with new msd 8.5 wires which all seem to be snug and installed correctly..... have never had headers, the car seems to perform well, but this backfiring sound for some reason does not sound "right".... any comments or is this just normal???

z28pat

iTrader: (10)

After installing my LTs and true duals, 18" bullet mufflers and an X pipe,
if I'm on the highway and keep the car in drive when I take my foot off the gas the car will sometimes backfire, and I'll hear a pretty loud pop.

pat

Heartless

Mine seems to run good at highway speeds and idles smooth.... I get the "pop" only when I romp on it and A4 winds up and shifts hard which is accompanied by the "pop".... I just wanted to convince myself there was nothing mechanically or ignition wise screwed up.....

bigman

iTrader: (1)

get a tune, it should go away. Now the part throttle backfires on the highway will always be there.