need advice!!! loudmouth exhaust with this header
Thread Starter
Teching In
Joined: May 2003
Posts: 33
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need advice!!! loudmouth exhaust with this header hey guys im gonna get the lm exhaust on my 00 Z28. i plan on getting slp lt headers with it. is this good to go. or what other header do you prefer. i kinda have to stay emission legal. i was thinking bout going with qtp but do i also need qtp y-pipe as well? im 85% leaning towards slp lt headers though..let me know which header will be bad *** loud and haul *****..thanks
Staging Lane
Joined: May 2003
Posts: 74
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From: north fl
Re: need advice!!! loudmouth exhaust with this header i have a loud mouth on my car. just make sure you put a set of cats on that exhaust otherwise it's gonna be damn loud. and make sure your willing to have all that noise in the car as well. it's not too bad up front but anytime i have people in the back they bitch like you wouldn't beleive. i am putting a set of longtubes on here in a few weeks. i will let you know how it sounds.
Re: need advice!!! loudmouth exhaust with this header
some have observed that adding headers with cats actually reduces the drone of the Loudmouth.
. After you clear the rasp it sounded bada$$. I had LT/ORY/LM. I switched to true duals and would never look back. 
Re: need advice!!! loudmouth exhaust with this header I would do a searh on SLP headers b4 I bought them if I were you. You will find that the perfomance gains do not compete with the competition nor do the fitment issues.
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TECH Fanatic
Joined: Jul 2002
Posts: 1,218
Likes: 1
From: MI
Re: need advice!!! loudmouth exhaust with this header I would not get the SLP's. I just saw a firehawk at the strip a few weeks ago and he had slp headers and a loud mouth. The thing didn't put down impressive numbers at all(I was rippin' better et's and traps with my stock ws6 w/ lid). I may have gotten a factory freak but he should have been able to keep up somewhat. That and it sounded like a wound up crotch rocket on steroids when he went down the strip. From other's experiences I would stay away from the SLP headers they seem to have a high dollar per horsepower ratio.....aka: ripoff.
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Re: need advice!!! loudmouth exhaust with this header I have SLP longtubes with the Loudmouth and no cats. It is bloody loud!! I'am also lowered with the prokit. The y-pipe hangs pretty low. But this combition is possible. I love my SLP lt's. No problems at all. Took 2 full days with friends to install them on jack stands and rhino ramps. If emissions isn't a problem save yourself the money at run em straight. My next mod is hearing aids.
TECH Junkie
Joined: Dec 2001
Posts: 3,242
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From: Lakeland, FL
Re: need advice!!! loudmouth exhaust with this header I have SLP's as well, They are harder than probably all headers to put in but once they are in the fitment and finish is great. Performance wise we have all found that the SLP's are not as good as other headers, With heads and cam they are probably a good 10-15 hp less than the QTPs/Kooks, I am gonna have to swap mine out so I would recommend that you save the trouble and just get the Qtp's/Kooks so you don't have to do it twice, Also with the SLP's you still have to pay alot. Also instead of getting the Loudmouth you may consider an electric cutout or even the qtp dual cutout y, then you could have open headers at the flip of a switch and when the cops are around or when you are taking out your girl you can make it quiet. Anyways hope some of this helps.
Thread Starter
Teching In
Joined: May 2003
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Re: need advice!!! loudmouth exhaust with this header well ive been emailing this guy from tbyrne motorsports and he says that an average hes seen about 25 hp from the slp longtubes. and as for the qtp ill still be looking into them. but if i do go with qtp what would i need besides the header. i still wanna run with loudmouth though!!
Administrator
Joined: Jan 2002
Posts: 45,841
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From: Earth
Re: need advice!!! loudmouth exhaust with this header You will hate the LM with headers. It sounds like pure ***. Extremely raspy and loud. I hope there aren't any cops in your area 'cuz they will give you a hard time about it. I'd suggest getting a different catback if you're going to run headers.
Thread Starter
Teching In
Joined: May 2003
Posts: 33
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Re: need advice!!! loudmouth exhaust with this header okay what bout MAC full lengths with my loudmouth. ive been looking at MAC and they seem to be pretty popular. i gotta stay emissions though. so do i get the y-pipe with cat? and also do i have to mess with the 02 simms or anything, and do you guys know due to my model with that egr crap if MAC has headers for those...thanks alot
Administrator
Joined: Jan 2002
Posts: 45,841
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From: Earth
Re: need advice!!! loudmouth exhaust with this header I think your barking up the wrong tree with the LM and headers. Changing to a different brand of headers isn't going to change anything. It's the LM itself. Combine that with headers and
Re: need advice!!! loudmouth exhaust with this header Other than being slightly deeper in the lower revs and screaming above 3500, I didn't notice a huge difference in LM with catted LT's vs. stock manifolds volume wise. The key is to run cats. I've heard the LM with ORP and it does sound terrible. But with cats, I think the setup sounds damn good. Just IMO.
Thread Starter
Teching In
Joined: May 2003
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Re: need advice!!! loudmouth exhaust with this header loudmouth sounds just to sweet. i do plan on running with high flow cats though. but i cant seem to make up my mind with msc headers or slp headers!!