SLP headers... any users???
Race Director
Joined: Jun 2004
Posts: 19,459
Likes: 48
From: Schaumburg IL
CI 7-8-9-11 Veteran
St. Jude Donor '06-'10, '13
Originally Posted by gmf
I have them also. I dyno'd 326 rwhp / 338 rwtq with the headers/hi-flow cats/loudmouth/blackwing. I was 293 before the work I believe..my signature has info
I have a 98 A4.
I have a 98 A4.
I have the loudmouth system, but just cat-back w stock H pipe and stock manifolds and it's LOUD enough..I can't imagine Loudmouths w headers 
Burning Brakes
Joined: Jun 2002
Posts: 1,202
Likes: 0
From: Clarksburg MD
Originally Posted by baldy26
man that has just got to be louder than SH**!! I have the loudmouth system, but just cat-back w stock H pipe and stock manifolds and it's LOUD enough..I can't imagine Loudmouths w headers
I have the loudmouth system, but just cat-back w stock H pipe and stock manifolds and it's LOUD enough..I can't imagine Loudmouths w headers 
I got rid of my loud mouths. I do have the SLP X-Pipe w/ resonator on the car, but looking to sell it. No need to have that now that I have Z06 Ti's.
Race Director
Joined: Jun 2004
Posts: 19,459
Likes: 48
From: Schaumburg IL
CI 7-8-9-11 Veteran
St. Jude Donor '06-'10, '13
Gmf , so if I went with Headers I would probably want to get an X-pipe set up if I wanted to keep my Loudmouths..either that or switch to something a bit more tame like the Corsa Indys?? 
Instructor
Joined: Sep 2003
Posts: 147
Likes: 0
From: mission b.c.
i have slp headers,hiflo cats magnaflow cat back, blackwing on my o2 a4.the magnaflow xpipe wouldn't fit back on after the slp's. i dynoed at 313 hp ,322 tq on a+a's corvettes (california) on only 91 octane.pulled a 12.69 1/4 mile with these mods and a ss3200 yank .had a few issues with the slp's, but now are resolved and i am ok with them.
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Burning Brakes
Joined: Jun 2002
Posts: 1,202
Likes: 0
From: Clarksburg MD
No - not for the headers. I wanted the Xpipe w/ Resonator to match up with the loud mouth exhaust.
Originally Posted by baldy26
Gmf , so if I went with Headers I would probably want to get an X-pipe set up if I wanted to keep my Loudmouths..either that or switch to something a bit more tame like the Corsa Indys??
Instructor
Joined: Sep 2003
Posts: 147
Likes: 0
From: mission b.c.
slp issues.1.instructions say 9.5 hrs. install for prof. mechanic.muffler shop took 14 hrs.i called another shop w/ vette -slp experience and was quoted 15 hrs.i had a starter problem (ceramic cracked and the posts weren't making contact) because of faulty wire install (installers fault)?but you have to pull the header off to pull starter.had to do it twice and finally they spliced the wires higher up to run 1 wire to a post ,covered it in fireproof asbestos and lengthened it to run it further from the headers. 2.a few weeks after initial install i started showing code p1153,bank 2 sensor 1 insufficient switching . i would delete it 2 or 3 times per day with my predator .i have changed the sensors 3 times and still get it on a regular basis. slp advised me to have the code removed from the computer by edit or they could do it.anyhow , like i have said i'm happy with them now and it did make a difference in sotp feel and in 1/4 mile times(about .25 seconds )
Advanced
Joined: Jan 2004
Posts: 97
Likes: 0
From: Tinley Park IL
I had the same prob with the wiring on mine. I had the headers, no cats, x-pipe (weld on) and loudmouth on for over 4 months and it sounded great. I loved the old muscle car sound when I was driving. It was great to make Harley owners come up to you and say that the car is way to loud. I had the same setup though with the Borla Stingers (2 tip) and I switched to the loudmouths because the borlas sounded importy (high-pitch resonance) without the cats and headers on the car. I got lucky on the install price because the speed shop I went to had never done them on anyone (including f-bodies) and gave me a price quote for install on TPIS headers. The increase in horsepower was awesome, it was like a whole new beast.
Last edited by Apollyon; Aug 18, 2004 at 08:59 PM.