Exhaust question

energiesource · July 30th, 2007, 12:59 PM

So when youre driving along and at about 3 or 4 grand you let off, what causes that backpressure popping or whatever it is? I fucking hate that noise and thats all i hear with my LM2 is there any engine mods i can do to make that less obvious (it'll be a good excuse to mod the engine)

06RedfireGT · July 30th, 2007, 01:47 PM

is all you have is the LM2 as far as exhaust?

blk01gt · July 30th, 2007, 01:54 PM

my magnapacks did that really bad with my o/r h pipe so i swapped it out for an o/r x pipe and its a lot better now. From what i have read the straight through mufflers tend to do a lot better with x-pipes

energiesource · July 30th, 2007, 01:55 PM

yeah i have stock everything but the lm2
im getting a twin turbo soon and it comes with basically everything up to the midpipe so buying another one would be pointless i thought,

06RedfireGT · July 30th, 2007, 01:57 PM

i dont know what to tell you. usually the midpipe causes the crackling but...the only thing i can think of is to sell the LM2 and buy a new catback.

energiesource · July 30th, 2007, 01:58 PM

well if a mid pipe will fix it, then thats fine, but if it has something to do with the catback then im screwed

06RedfireGT · July 30th, 2007, 02:00 PM

well like i said before 9 times out of 10 the midpipe causes the crackling but since your is stock, the only thing it could be is the cat back

mustangmanic · July 30th, 2007, 02:01 PM

Originally Posted by energiesource

So when youre driving along and at about 3 or 4 grand you let off, what causes that backpressure popping or whatever it is? I fucking hate that noise and thats all i hear with my LM2 is there any engine mods i can do to make that less obvious (it'll be a good excuse to mod the engine)

every car does it its just more obvious with a v8. Its unused fuel burning up in the exhaust pipes, thats whey you never hear it when your engine is cold b/c the pipes arnt warm yet. but thats what it is and you cant really avoid it with a v8 but you can do things to make it less loud like an o/r x-pipe.. The design of the x doesnt allow the sound to "echo" like a H or a prochamber does so it wouldnt be as loud

energiesource · July 30th, 2007, 02:04 PM

ohh i thought you meant usually its the midpipe as in getting an aftermarket one would make it go away

04GTAMPA · July 30th, 2007, 02:06 PM

A good tune will fix that for you...

TheBusher · July 30th, 2007, 02:08 PM

Originally Posted by energiesource

So when youre driving along and at about 3 or 4 grand you let off, what causes that backpressure popping or whatever it is? I fucking hate that noise and thats all i hear with my LM2 is there any engine mods i can do to make that less obvious (it'll be a good excuse to mod the engine)

I actually started to get just a little bit of exhaust pop even with an all stock exhaust... until recently I used sea foam and it completely got rid of it. I don't know if that will fix your problem because I've heard that aftermarket exhaust almost always pops, but it might help.

energiesource · July 30th, 2007, 02:13 PM

Originally Posted by 04GTAMPA

A good tune will fix that for you...

as in a hand held tuner, or a dyno tune kinda thing

04GTAMPA · July 30th, 2007, 02:22 PM

You will need to actively work with your A/F levels, so I would say a dyno tune. That's how I got rid of the "farting" out of the car. It sounded like a civic coming to a stop in first gear. "broooommm, prup pop pop pop"

energiesource · July 30th, 2007, 02:23 PM

lol yeah i hate that sound
i heard that alot with people with turbos, i hope they wont sound like that

04GTAMPA · July 30th, 2007, 02:28 PM

Again, the tune will make it or break it. Insist with the tuner to be as perfect as possible. Sometimes the tuners will just put it on the dyno, get some numbers, add/remove fuel/timing and that's it. They don't tweak it enough to get perfection out of it unless you show them you know what you want... Remember, you're paying them, not a favor.

July 30th, 2007, 12:59 PM	#1
energiesource MM Fanatic Join Date: Oct 2006 Location: Up der in canada eh Posts: 3,527 iTrader: 1 reviews	Exhaust question So when youre driving along and at about 3 or 4 grand you let off, what causes that backpressure popping or whatever it is? I fucking hate that noise and thats all i hear with my LM2 is there any engine mods i can do to make that less obvious (it'll be a good excuse to mod the engine) __________________ 2000 Mustang GT, 417hp/421tq, P1SC @ 6 psi(?), Custom grind cams, Steeda Triax shifter, SLP LM2, MAC L/T and O/R H-pipe. 18x9/10 Flat Black FR500's, Mach C-pillars, bullitt side scoops/skirts.

July 30th, 2007, 01:47 PM	#2
06RedfireGT One Man Wolf Pack 2006 Mustang GT 13ish....maybe Join Date: Aug 2006 Location: Regulatin On Some OGs Posts: 22,491 iTrader: 2 reviews	is all you have is the LM2 as far as exhaust? __________________ ΜΟΛΩΝ ΛΑΒΕ

July 30th, 2007, 01:54 PM	#3
blk01gt Regular Join Date: May 2007 Posts: 196 iTrader: 0 reviews	my magnapacks did that really bad with my o/r h pipe so i swapped it out for an o/r x pipe and its a lot better now. From what i have read the straight through mufflers tend to do a lot better with x-pipes __________________ 01 Mustang GT \| 5 Speed \| Bullitt Intake \| 4.10's \| Diablo Tuner \| JLT CAI \| Flowtech LT Headers, bbk catted H, dynomax catback \| 01 Carbon Black BMW M3 w/dynomax exhaust

July 30th, 2007, 01:55 PM	#4
energiesource MM Fanatic Join Date: Oct 2006 Location: Up der in canada eh Posts: 3,527 iTrader: 1 reviews	yeah i have stock everything but the lm2 im getting a twin turbo soon and it comes with basically everything up to the midpipe so buying another one would be pointless i thought, __________________ 2000 Mustang GT, 417hp/421tq, P1SC @ 6 psi(?), Custom grind cams, Steeda Triax shifter, SLP LM2, MAC L/T and O/R H-pipe. 18x9/10 Flat Black FR500's, Mach C-pillars, bullitt side scoops/skirts.

July 30th, 2007, 01:57 PM	#5
06RedfireGT One Man Wolf Pack 2006 Mustang GT 13ish....maybe Join Date: Aug 2006 Location: Regulatin On Some OGs Posts: 22,491 iTrader: 2 reviews	i dont know what to tell you. usually the midpipe causes the crackling but...the only thing i can think of is to sell the LM2 and buy a new catback. __________________ ΜΟΛΩΝ ΛΑΒΕ

Exhaust question

Exhaust question

Re: Exhaust question

Re: Exhaust question

July 30th, 2007, 01:58 PM	#6
energiesource MM Fanatic Join Date: Oct 2006 Location: Up der in canada eh Posts: 3,527 iTrader: 1 reviews	well if a mid pipe will fix it, then thats fine, but if it has something to do with the catback then im screwed __________________ 2000 Mustang GT, 417hp/421tq, P1SC @ 6 psi(?), Custom grind cams, Steeda Triax shifter, SLP LM2, MAC L/T and O/R H-pipe. 18x9/10 Flat Black FR500's, Mach C-pillars, bullitt side scoops/skirts.

July 30th, 2007, 02:00 PM	#7
06RedfireGT One Man Wolf Pack 2006 Mustang GT 13ish....maybe Join Date: Aug 2006 Location: Regulatin On Some OGs Posts: 22,491 iTrader: 2 reviews	well like i said before 9 times out of 10 the midpipe causes the crackling but since your is stock, the only thing it could be is the cat back __________________ ΜΟΛΩΝ ΛΑΒΕ

July 30th, 2007, 02:04 PM	#9
energiesource MM Fanatic Join Date: Oct 2006 Location: Up der in canada eh Posts: 3,527 iTrader: 1 reviews	ohh i thought you meant usually its the midpipe as in getting an aftermarket one would make it go away __________________ 2000 Mustang GT, 417hp/421tq, P1SC @ 6 psi(?), Custom grind cams, Steeda Triax shifter, SLP LM2, MAC L/T and O/R H-pipe. 18x9/10 Flat Black FR500's, Mach C-pillars, bullitt side scoops/skirts.

July 30th, 2007, 02:06 PM	#10
04GTAMPA Hardcore Enthusiast 2001 Mustang SVT Cobra Join Date: Apr 2007 Location: Riverview, FL Posts: 2,742 iTrader: 1 reviews	A good tune will fix that for you... __________________ Slow, really slow Cobra. Wanna see? MM Cobra Club Member #81 "TAMPA BAY AREA CREW"

July 30th, 2007, 02:22 PM	#13
04GTAMPA Hardcore Enthusiast 2001 Mustang SVT Cobra Join Date: Apr 2007 Location: Riverview, FL Posts: 2,742 iTrader: 1 reviews	You will need to actively work with your A/F levels, so I would say a dyno tune. That's how I got rid of the "farting" out of the car. It sounded like a civic coming to a stop in first gear. "broooommm, prup pop pop pop" __________________ Slow, really slow Cobra. Wanna see? MM Cobra Club Member #81 "TAMPA BAY AREA CREW"

July 30th, 2007, 02:23 PM	#14
energiesource MM Fanatic Join Date: Oct 2006 Location: Up der in canada eh Posts: 3,527 iTrader: 1 reviews	lol yeah i hate that sound i heard that alot with people with turbos, i hope they wont sound like that __________________ 2000 Mustang GT, 417hp/421tq, P1SC @ 6 psi(?), Custom grind cams, Steeda Triax shifter, SLP LM2, MAC L/T and O/R H-pipe. 18x9/10 Flat Black FR500's, Mach C-pillars, bullitt side scoops/skirts.

July 30th, 2007, 02:28 PM	#15
04GTAMPA Hardcore Enthusiast 2001 Mustang SVT Cobra Join Date: Apr 2007 Location: Riverview, FL Posts: 2,742 iTrader: 1 reviews	Again, the tune will make it or break it. Insist with the tuner to be as perfect as possible. Sometimes the tuners will just put it on the dyno, get some numbers, add/remove fuel/timing and that's it. They don't tweak it enough to get perfection out of it unless you show them you know what you want... Remember, you're paying them, not a favor. __________________ Slow, really slow Cobra. Wanna see? MM Cobra Club Member #81 "TAMPA BAY AREA CREW"

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