Installed ORP-Can you say RASP!
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Launching!
Joined: Mar 2003
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From: Castaic Lake, So. Cal.
Installed ORP-Can you say RASP! Since I have the Magnaflow muffler, I thought that an ORP would be cool and not suffer from rasp. WRONG! The rasp between 2200-2400 rpm's is horrible. I have mid-length headers and a cam. It sounds great otherwise, but that rasp sound like ****. The ORP made a huge difference in the sound. Looks like a bullet muffler is in my future. Has anyone not had success installing a bullet to reduce the rasp? 
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Re: Installed ORP-Can you say RASP! I have the exact same setup. I've been living with the rasp for a while now... It's funny though, I used to have LM exhaust and the rasp was a lot worse. At least with the Maganflow you could calm the rasp down a bit if you give it just a little throttle during the dreaded 2200-2500 range. With LM it ALWAYS had a horrible rasp.
I think two bullets (where each cat would be) is the best way to go. I have resisted doing this because I am not sure if I am going to need to put cats on in the future anyway come inspection time.
Good luck.
Tommy
I think two bullets (where each cat would be) is the best way to go. I have resisted doing this because I am not sure if I am going to need to put cats on in the future anyway come inspection time.
Good luck.
Tommy
Thread Starter
Launching!
Joined: Mar 2003
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From: Castaic Lake, So. Cal.
Re: Installed ORP-Can you say RASP! Rasp is a sound that is inconsistant with the exhaust note. It is higher pitched and quite louder, and usually happens within a narrow rpm range. I believe that is is a resonance frequency. Guys claim that a true-dual exhaust will prevent it. I hate it.
Thread Starter
Launching!
Joined: Mar 2003
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From: Castaic Lake, So. Cal.
Re: Installed ORP-Can you say RASP! Really! 95%! I will be the happiest guy in the world if it works that well for me. Has anyone tried any other 4" muffler besides Dynomax? I still have the 2-3\4" rear pipe, hope I can find those inlet/outlet sizes. I heard some guys have used a chambered muffler, I wonder how that sounds?
Re: Installed ORP-Can you say RASP! I'll tell you this...I have LTs with cats in a custom Y with a Flowmaster collector and a Magnaflow muffler and it still makes that noise...its quieter than just straight off road, but its still there and I HATE it. I tried 2 bullets and they were no good, so I went to cats.
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TECH Junkie
Joined: Dec 2001
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From: Lakeland, FL
Re: Installed ORP-Can you say RASP! I just switched to duals cause of the rasp after I put on my Hooker headers and hooker y. I was thinking maybe it was the y but if you guys have the flowmaster y it must not be that? Whats even more funny is with my slp lt's and y I did not have any rasp. I was using the hooker catback with both setups before I went dual as well and I think that muffler is one of the best at eliminating rasp.
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Re: Installed ORP-Can you say RASP! I put a 18" long Magnaflow bullit muffler in my I pipe to also reduce the rasp and it did a really great job. There is still rasp when you let off the gas at high rpms but it did totally eliminate the rasp around 2200-2600 rpms you were talking about.
Re: Installed ORP-Can you say RASP! if you have a catted mac y pipe put that back on and gut your cats out a friend of mine tried putting a off road mac y pipe with his magnaflow on and it sounded like **** with his magnaflow he gutted his catted y pipe and he said "its probably the best sounding car ive owned" give it a try cheaper than buying bullets or trying anything else
Thread Starter
Launching!
Joined: Mar 2003
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From: Castaic Lake, So. Cal.
Re: Installed ORP-Can you say RASP! No way Kurt, I need those cats for my emissions thing here in Cali'. I am going to install a bullet muffler, I gained 1" ground clearance with the ORP, that means that I can lower the car a little more, so it is worth my while and bucks to set the car up for an ORP. I will kill this rasp if it's the last thing I do.
Re: Installed ORP-Can you say RASP! Borla and offroad Y is THE worst sounding LS1 system ever. Its terrible with the echoing rasp from hell. Think of a ricer with a louder exhaust for an idea of what it sounds like.
SLP dual-dual muffler will get rid of the rasp and make just as much power as any other catback. I love this setup (had it on my Formula also)
You can also install a Borla XR1 straight-thru muffler in the midpipe, it will kill the rasp. Pricey mufflers though
Tony
SLP dual-dual muffler will get rid of the rasp and make just as much power as any other catback. I love this setup (had it on my Formula also)
You can also install a Borla XR1 straight-thru muffler in the midpipe, it will kill the rasp. Pricey mufflers though
Tony
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Joined: Feb 2002
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From: Austin, Tx.
Re: Installed ORP-Can you say RASP!
SLP dual-dual muffler will get rid of the rasp and make just as much power as any other catback. I love this setup (had it on my Formula also)
I can shift faster than you.
iTrader: (21)
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From: Baton Rouge, LA
Re: Installed ORP-Can you say RASP! I had MAC headers w/ off-road, 3" Dynomax bullet muffler in the intermedate pipe and a wide-open Borla about 3 years ago and still had a little rasp. The 3" bullet muffler really got rid of 75% of the rasp, if not more. Here is a sound clip at WOT:
http://members.***.net/jason99ta/eunice1211.mpeg
This was with the MTI B1 cam, 4:10s, and stock LS1 intake.
Jason
http://members.***.net/jason99ta/eunice1211.mpeg
This was with the MTI B1 cam, 4:10s, and stock LS1 intake.
Jason
Re: Installed ORP-Can you say RASP! i have hooker LTs, ORY w/ no cats and a cutout
and the rasp between 2200-2500 is horrible also
but even since i got the 3200 vig. i jump right by it most of the time now
and the rasp between 2200-2500 is horrible also
but even since i got the 3200 vig. i jump right by it most of the time now
Re: Installed ORP-Can you say RASP! 72sub, the SLP "Dual-Dual" is the factory catback for all Pontiac Firehawks, and was the optional exhaust for the SS Camaro. SLP sells it, as well as most of the sponsors here that carry SLP products. Here is a link:
http://www.slponline.com/view_produc...RTNUMBER=31029
Tony
http://www.slponline.com/view_produc...RTNUMBER=31029
Tony
I can shift faster than you.
iTrader: (21)
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From: Baton Rouge, LA
Re: Installed ORP-Can you say RASP! The SLP dual/dual and the MAC headers with ORP is one of the best sounding setups, hands down. I had a friend with an '00 SS that intalled this exact exhaust setup on and he couldn't have been happier.
Jason
Jason
Thread Starter
Launching!
Joined: Mar 2003
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From: Castaic Lake, So. Cal.
Re: Installed ORP-Can you say RASP! Really cool video Jason. I called my girlfriend up to the computer room to watch the clip at full volume, and she got a little squishy watching it (she loves hot cars). Thanks. 