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Anyone test LM I vs LM II at the track ??

This is a discussion on Anyone test LM I vs LM II at the track ?? within the External Engine forums, part of the LSx Technical Help Section category; I know the LM I can be a bit much for some. So SLP must have had a lot of ...

  1. #1
    Join Date
    Apr 2006

    1998 Z28

    Anyone test LM I vs LM II at the track ??

    I know the LM I can be a bit much for some.
    So SLP must have had a lot of guys wanting them to tame it down.

    I just got a LM II muffler for testing, & was surprised to find that it is
    restricted inside. A 2.25" pipe is a little 'loose' when sticking it in the muffler, so I'm guessing the inside diameter is at what the inside diameter of a 2.5" pipe is, or approx: 2.37".

    So that's why they made the new LM, a 'modular' design, so you can switch out the LM II muffler when you what to make some power at the track. Or is it a 'marketing' move, to package the system in a smaller box ?

    SLP Quote on the LM II muffler:
    A bit milder without sacrificing that legendary SLP quality & power.
    A little quiter than the original LM I.

    Ok exhaust flow gurus... Will this perforated 2.5" pipe inside a 14" long, 4" diameter bullet muffler case, cause a HP loss ?? Or does SLP know their sh!t.

    Has anyone tested both LM I & LM II at the track to see if there's a power loss ??

    I have a 3" system on a 12.9x @ 107.xx car. I'll be testing this in the rear as a 'tailpipe', in my system. So it will be easy to make a few runs with it in place. Then a few more runs with it removed.

  2. #2
    Visualize°Design°Create SSwt00SS's Avatar
    Join Date
    Dec 2005
    Dallas, TX

    '12 Silver SS 1SS
    '00 Black SS #8617

    there wont really be that much of a performance difference. i have the LM1 and the resonator is just hollow. the performance difference between the two is really only about sound (w/the LM2 slightly more refined). one system or the other will not be faster than the other. they are both low/no restriction straight through exhaust systems...

    so, NO, no loss or gain in HP from one system to the other...
    2000 SS - The Wicked Witch: °°Cammed 'n Slammed°° 458rwhp/410rwtq
    Quote Originally Posted by Bowtie_girl30
    I was hoping to just hump her up the exhaust cause she is so damn sexy....
    "Never argue with an idiot. They drag you down to their level, then beat you with experience."

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