Track car exhaust ideas
12-16-2013, 12:25 PM
#31
Rennlist Member
Adam -
This combo is NOT going to meet 90dB. I have the Devek L2 headers, long Y to a 3.5" single. With two of the Borla XR-1s in line, I was hitting 94-95 dB at full throttle at the exit of Turn 6 at Laguna Seca. I had to add a Supertrapp w/ a 90° turn away from the sound booth just to achieve 92 dB.
90dB is quiet. Like stock exhaust quiet. Stock 997GT3's can't make that number at full throttle. You'll need something more serious/restrictive than the XR-1s to achieve this.
Sorry to be the bearer of bad news. The combo you're describing is an aural masterpiece but it's not quiet.
This combo is NOT going to meet 90dB. I have the Devek L2 headers, long Y to a 3.5" single. With two of the Borla XR-1s in line, I was hitting 94-95 dB at full throttle at the exit of Turn 6 at Laguna Seca. I had to add a Supertrapp w/ a 90° turn away from the sound booth just to achieve 92 dB.
90dB is quiet. Like stock exhaust quiet. Stock 997GT3's can't make that number at full throttle. You'll need something more serious/restrictive than the XR-1s to achieve this.
Sorry to be the bearer of bad news. The combo you're describing is an aural masterpiece but it's not quiet.
12-16-2013, 05:37 PM
#32
Race Director
One way to reduce overall noise is where the output of the exhaust is....mine is on drivers side just after of the rear crossmember.... I never have been hit for sound, but haven't ran laguna either
12-16-2013, 06:25 PM
#33
Part number, and where you got it from, please? And it's 3" in and out?
12-18-2013, 01:44 AM
#34
Rennlist Member
Thread Starter
So the 2nd Borla arrived today, a 15"x5" round sportsman XR-1 40085. ($112)
The oval is a multi-core XR-1 40575. ($230). Both are 3" centers. Got them both off eBay.
The fit, perfecto!
The oval is a multi-core XR-1 40575. ($230). Both are 3" centers. Got them both off eBay.
The fit, perfecto!
12-20-2013, 12:08 AM
#35
Rennlist Member
Thread Starter
Last muffler came in today, looks like it will fit no problem:
Did get the headers back from the coaters, and now that I see them again I'm going to stick with the flanges. The collectors are so short I'm hesitant to cut any length off to fit the V-bands.
Did get the headers back from the coaters, and now that I see them again I'm going to stick with the flanges. The collectors are so short I'm hesitant to cut any length off to fit the V-bands.
12-20-2013, 05:09 AM
#36
Racer
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12-23-2013, 08:08 PM
#40
Official Bay Area Patriot
Fuse 24 Assassin
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Fuse 24 Assassin
Rennlist Member
ATB, I'm doing the exact exhaust setup with a 3" single Y, but after cats. It will be ducted to a 3" round muffler sitting in the intermediate area with a second 3" straight through where the factory muffler sits in the rear and an oval Flowmaster exhaust tip. I opted to keep the cats (not factory, but aftermarket metallic spun types) since it's a street car and to keep the bite down of the exhaust. From what I hear, the sound of a single 3"-3.5" is addicting on these cars.
12-24-2013, 02:16 PM
#42
Rennlist Member
Thread Starter
Looking forward to getting it all hooked up. Need to get the engine in first though. Just got done installing the late model engine cross brace, and am in the process of installing the aluminum rack bushings. Once that's done, the rack goes back in, new ball joints go in, and time to drop in the engine.