ok since headers installed and cats removed when i get into it bout half throttle it sounds like a warsher rattling in my rear half of the exhaust... not at normal driving but only when into it for a quicker merge into traffic... and it dies as soon as the car shifts,... i would say at about 3200rpms.......
now i know i shook out all the y-pipe and nothing could have gotten into the intermediate pipe... so is this the rasp i have heard about? it sounds like a metal rattle... but i have been all over the car cant find it touching no where.... only other thing i thought of was the extra mount for y-pipe that holds it to the drive floorboard... but this seems solid and it sounds like its in the back of the car..... the car has the SLP dual/dual with Lpp headers and ORY pipe..
and it kinda sounds like old glasspacks that rotted out... but its sounds more metal rattle
thanks guys
__________________ 2000 Firehawk TransAm #328 of 741
Stock....for now
Well I wouldn't say rasp sounds like something rattling around in your exhaust but I guess it's possible. I was in marching band for years so I think of rasp as someone overblowing their trumpet or trombone. It's a very metallic, edgy, splatty sound.
Here is a clip of a car with a lot of rasp! Listen in the first 4 seconds
can i get like a bullet muffler and cut it out?... i dont want cats.... but i may get some later.... i cant think of anything that would cause this sound it has to be the exhaust...
that vid is almost how mine sounds so i guess it is rasp...
__________________ 2000 Firehawk TransAm #328 of 741
Stock....for now
The ceramic brick style cats cut out the rasp a lot more than the newer style higher flowing metallic core cats. I have rasp with my true duals & metallic cats. The rasp is difficult to remove without a big muffler or a bullet with cats. Borla XR1 bullets quiet down the exhaust more than dynomax bullets. I'm not sure where magnaflow fits in with that.
A new set-up out there that seems to be doing a good job at killing rasp is the new SLP powerflo exhaust, which is basically 3 bullets. http://www.byunspeed.com/product_inf...ducts_id=10614
I've heard of a piece breaking before in the slp dual/dual catback muffler. You may want to look into it.
__________________ 2002 Z28, NBM, M6, totally SWEET!
milled TSP 5.3l heads, 238/240 .615/.609 111+4(spec'd by Pat G), vengence ported FAST90, NW90 TB, Ford 42lb injectors, Walbro 255l pump, LPP headers/ory, Textralia OZ700 clutch, built tranny, 3.90s, TTM wheels, SS spoiler, Sunoco hood
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You can get a powerstick 20" http://www.classicchambered.com/ put that in the I-pipe and that should help out alot. I have Kook's LT, Catted Y and GMMG CB. An I just got my car back from my tuner and the rasp is gone completely. But since you don't have any cats it still should take out the rasp or a majority of it and then get a Flowmaster merge and that should kill it period.
__________________ 98 Red Camaro SS M6, 226/228 .585/.588 112 LSA, P&P 241 Heads, GMMG Catback to CME, Kooks LT's and Catted Y, FTP 85mm lid, SLP 85mm MAF, SLP Flow Pac, LS6 Intake, Shaner S3 P&P TB, TB Bypass, SLP UD Pulley, 160 degree Thermo, LS 6 Oil Pump, LS2 timing chain, American Racing TTII 17X9.5, Hurst Billet Competition Shifter with Speed Dawg Ball
425rwhp/407rwtq
06 Cobalt SS/Supercharged Stage 2 Kit, 5-speed, GMPP Catback this is my DD.
No cats, I put 2 12" resonators (glass packs) from classic chamber right before the tips. They completely removed my rasp. I have a GMMG and LT with ORY. I also have a dynomax bullet after the Y before the GMMG. It sounds just like it did before the headers but with ZERO Drone.
No cats, I put 2 12" resonators (glass packs) from classic chamber right before the tips. They completely removed my rasp. I have a GMMG and LT with ORY. I also have a dynomax bullet after the Y before the GMMG. It sounds just like it did before the headers but with ZERO Drone.
Prey that sounds good but damn your exhaust has to weigh about 1 ton. lol But either way it takes that shit out and it sounds alot better.
__________________ 98 Red Camaro SS M6, 226/228 .585/.588 112 LSA, P&P 241 Heads, GMMG Catback to CME, Kooks LT's and Catted Y, FTP 85mm lid, SLP 85mm MAF, SLP Flow Pac, LS6 Intake, Shaner S3 P&P TB, TB Bypass, SLP UD Pulley, 160 degree Thermo, LS 6 Oil Pump, LS2 timing chain, American Racing TTII 17X9.5, Hurst Billet Competition Shifter with Speed Dawg Ball
425rwhp/407rwtq
06 Cobalt SS/Supercharged Stage 2 Kit, 5-speed, GMPP Catback this is my DD.
Yea, I suppose it is heavier, but if I'm worried about weight I better look down. My fat ass could stand to lose 40 lbs. I have pictures at home I will post, and I will post another you tube. I have it without the resonators posted now. You can here the rasp when I rev it but the rasp is much louder under load. Like I said it is completely gone now.
Yea, I suppose it is heavier, but if I'm worried about weight I better look down. My fat ass could stand to lose 40 lbs. I have pictures at home I will post, and I will post another you tube. I have it without the resonators posted now. You can here the rasp when I rev it but the rasp is much louder under load. Like I said it is completely gone now.
You crazy prey good job on getting the rasp out of there. lol
__________________ 98 Red Camaro SS M6, 226/228 .585/.588 112 LSA, P&P 241 Heads, GMMG Catback to CME, Kooks LT's and Catted Y, FTP 85mm lid, SLP 85mm MAF, SLP Flow Pac, LS6 Intake, Shaner S3 P&P TB, TB Bypass, SLP UD Pulley, 160 degree Thermo, LS 6 Oil Pump, LS2 timing chain, American Racing TTII 17X9.5, Hurst Billet Competition Shifter with Speed Dawg Ball
425rwhp/407rwtq
06 Cobalt SS/Supercharged Stage 2 Kit, 5-speed, GMPP Catback this is my DD.
thanks fellas i will be lookin into something soon.... its killer.... do you think the tune will help it any? either way.... i will also look into the broken muffler as stated by jimmypop13... cause to me its sounds metallic rattle....
__________________ 2000 Firehawk TransAm #328 of 741
Stock....for now
can i get like a bullet muffler and cut it out?... i dont want cats.... but i may get some later.... i cant think of anything that would cause this sound it has to be the exhaust...
that vid is almost how mine sounds so i guess it is rasp...
I use a magna flow bullet in the eye about 8 inches from the merge from the y and got rid of my rasp plus the turbo help also. But with the turbo off it has a very low rumble at idle.
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14psi
exhaust rasp after header install??? 
