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Lid + Catback ? What kind of gains?

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Old 04-30-2008, 08:42 PM
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Originally Posted by RPM WS6
An M6 LS1 car should do better than 13.9 (assuming you are a good driver), including even a heavy 'vert. Only reason why you would run that slow would be if the drivetrain needed some attention, or the tires were trash.

People have put hardtop/t-top M6 LS1s into the 13.0-13.1 range stock (with a select few factory freaks even hitting 12.8-12.9). Granted, those are great drivers with great weather & traction, and most won't run quite that fast stock. But even your 'vert should have no issues running some solid mid-13s with a lid & catback.
Here's a freak for you:http://youtube.com/watch?v=SkXFFrpVgRQ
Old 04-30-2008, 08:48 PM
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With a SLP LM1 and K&N with the stock lid butchered(if it mattered) on my 99 bone stock put down 317 and 327 at the wheels is the best I saw out of it. Stock crank horsepower was rated 305hp. Those are great #'s for the mods, but doesn't necessarily mean that's gaurenteed what you'll put down. But it's possible.

The Loudmouth is loud, but becomes obnoxious once you put longtubes on. It doubles it's loudness once you put a cam in it just about. Great choice if you want it loud.
Old 04-30-2008, 08:55 PM
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Originally Posted by NHRAMAN
Any lid will do--basically a lid is a lid...MTI might be better..some had had rubbing issues with hood contact with SLP--I have slp and no problems though---as far as a catback--LM 1 is REALLY LOUD..check out LS1SOUNDS for vids/sounds.
The only people who had rubbing issues were those running the smooth bellows AND the lid, the smooth bellows is what pushes the lid into the hood, its not a design flaw in the lid. I'm running the SLP lid like you with no rubbing issues whatsoever with the stock accordian piece connecting the MAF to the lid.

I'm also running the Loudmouth 1 and am happy with it as a daily driver, I like the sound and don't think it's raspy. Take into account though that I'm 19 and it seems as people get older, they like theyre exhaust quieter and more "refined" I guess you could say. The loudmouth is good because it flows very well and because it uses just a resonator and not a traditional muffler, it is light. If you were looking for other mods after the lid and catback but don't want to do headers then you will have to stay on the intake side. A ported throttle body or ls6 intake manifold would both help you make some more power. Just remember when you're modding that you need to do your research, take a lot of time to decide what you want out of your car, then look at aLL the options to get it and decide what fits you best. Hope this helps and happy modding!
Old 04-30-2008, 10:59 PM
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Originally Posted by RPM WS6

M6 LS1 + lid + catback = over 300rwhp no problem (on average).
+1 my '99 M6 made 316rwhp and 328rwtq with just a lid and catback.
Old 05-01-2008, 12:14 AM
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Originally Posted by krazy4
probably 340rwhp
less...
Old 05-01-2008, 05:51 AM
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You can always add a muffler to the LM1 when you get LTs.
Old 05-01-2008, 08:37 AM
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All awesome info, I guess I need to get out to the track then soon. Sucks it's about 50 miles one way to the drag strip from Dallas.
Old 05-01-2008, 08:39 AM
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I know I did my SLP Loudmouth I and my SLP ramair lid setup at the same time, and all I can say is seat of the pants dyno showed big improvements. Stock other than those two things my car went 13.28 @ 107. And thats also with a 2.73 geared auto car.
Old 05-01-2008, 08:41 AM
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Originally Posted by NHRAMAN
Any lid will do--basically a lid is a lid...MTI might be better..some had had rubbing issues with hood contact with SLP--I have slp and no problems though---as far as a catback--LM 1 is REALLY LOUD..check out LS1SOUNDS for vids/sounds.
The SLP Loudmouth I is not that loud with the stock manifolds and cats like he has. I didnt think mine was loud enough. When its time to do Longtubes and a ORY just pull the LMI out and toss in a dynomax bullet or borla or something like that.
Old 05-01-2008, 05:23 PM
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A4 will run 13.4 stock
Old 05-01-2008, 05:23 PM
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M6 12's easy
Old 05-01-2008, 05:27 PM
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Originally Posted by res0n0xg
good to know..... man i just don't wanna be slower than my 06 GT.

damn deal on the vert i got.... oh well, i still love the drop top.
I just wonder what it runs in the 1/4 stock. the GT was about a 13.9, i'm guessing this car is going to be about the same.
M6 LS1 should be way faster than 13.9. Probably get into the 12's unless it is very high mileage and not taken care of.
Old 05-01-2008, 05:30 PM
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Lid + Catback will probably gain you somewhere around 149rwhp with supporting mods... maybe more if you've got a factory freak..
Old 05-01-2008, 11:34 PM
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I made 331rwhp with a black wing lid, LM1,and 3.73s in our 02 WS.6 before a dyno tune(Tuned numbers in sig). Nearly every component in my trans is micropolished(and cryo'd) and its been claimed to add a little, but i didnt test it before and after so i dont know for sure..
Old 05-01-2008, 11:50 PM
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dont forget about the weight lose when you swap lm1 for stock exh.
that 12.69 with DR video is awsome
Old 05-01-2008, 11:57 PM
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Originally Posted by miamifan3413
i wonder wat he launched at?
Old 05-02-2008, 12:26 AM
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i have a 98 ta with a mti clear lid and lm1 cat back and the sound is pretty good not too too loud but just loud enough. i am getting headers and y-pipe this month and will see how it changes. the gains arent really all that noticeable really but again i havent been to the track or really raced anyone yet...................
Old 05-02-2008, 07:44 AM
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The dyno #'s on my sig was with a SLP lid and LM. but through 4.11's Kinda low if you ask me.
Old 05-02-2008, 07:59 AM
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I have a 00 vert and ran 13.9 stock. I suck at shifting though. My dyno numbers are below. These were after all my bolt-ons. Seems kind of low but that's what it is.
Old 05-02-2008, 08:20 AM
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I would go lid only and forget the catback (unless you are die hard set on it)... it's a lot of money and not really a big power gainer..better off putting that money into headers IMHO.


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