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I put tsp headers n xpupe on my c6 gs, and it is loud n back fires like crazy i mean it sounds like m80s going off on deceleration . would putting b&bs headers with oem mid pipe tone it down a bit? ( my oem mid pipe has cats in it). Please anybody have this set up? I would greatl y appreciate input.
I have this, 1300ID's and e85 ARH and X no cats, NPP always open ... yes, a catted setup would muffle it... If I do some low boost but load up RPM driving and then downshift / rev match, I get the extremely loud M80 explosion (coming to work I have a long sweeping turn, slightly uphill but in an industrial park), if I just downshift / rev match I get pops and spurts... but at times it's real real loud. First time my wife heard it she screamed and thought we blew the exhaust off lol.
Last edited by sonnysucks; Sep 10, 2019 at 04:04 PM.
My car does the m80 explosion on every decel, how about anew cat back, borla touring?, b&b prt?
Sounds like your tune is overly fueled? do you have an AFR gauge in the car? I would say cats would muffle / dispel the pooled fuel / explosion on decel downshifts moreso than any other physical modification.
Rather than go through the trouble of swapping exhaust systems to make the backfires quieter, all your tuner/you/whoever needs to do is make the DFCO (decel fuel cut off) come in more aggressively. This can be adjusted to provide near-instant fuel shutoff when you're coming off the throttle, eliminating the sound. I'm H/C/I/boltons and I can have as many pops as I want or none just by playing around with these settings. That, and your map may be rich in the deceleration region.
A lot of people really like them, like the late-model BMW guys who get tunes JUST so their car will pop and burble a lot on decel. Because of this, I suspect that a lot of tuners make DFCO very lax and probably toss in a bit of extra fuel down low for extra effect.
I have ARH headers with cats, so it's a bit different, but I might be able to help. I found the car a bit too loud and droney with the npp open, and way too quiet with it closed. So I bought come 1/8" cable clamps and put them on the rods for the npp valves so that they hold the valves open about 5/16"-3/8". Now quiet mode is only a little quieter than open mode, and has none of the drone and less popping and gurgling on decel.
That was my thought exactly, too quiet closed, n too loid open.
Wow very clever,il try that before retuning . Can you explain a little more what you did,thanx
Very simple. I put the cable clamps on the rods, as you can see in the pic. They hold the valves open a little bit when they want to close. You can slide them to a different part of the rod to adjust how far they are help open. I have the clamps right against the nuts which holds the valves open about 5/16-3/8". That's the first place I tried, and I liked it, so I left it. But you can adjust to taste, just loosen, slide, re-tighten.
Raspy back fire, c6
