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Stock Exhaust W/Cats & Straight Pipes To Rear VS. Loudmouth? Resonance?

This is a discussion on Stock Exhaust W/Cats & Straight Pipes To Rear VS. Loudmouth? Resonance? within the External Engine forums, part of the LSx Technical Help Section category; Hi everyone... I have a bone stock 30th Anniversary Trans Am. I also have a 2006 SSR 6 speed with ...

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    Stock Exhaust W/Cats & Straight Pipes To Rear VS. Loudmouth? Resonance?

    Hi everyone...

    I have a bone stock 30th Anniversary Trans Am. I also have a 2006 SSR 6 speed with the LS2.

    When I purchased the SSR, the exhaust was TOO quiet. I installed a Flowmaster Super 40 where the stock muffler was (like the Trans Am, it has two cats into a Y-pipe). The Super 40 was TERRIBLE. I was expecting LOUD; what I got was loud INSIDE RESONANCE while it was still quiet outside; it wasn't that much louder than stock, and had a muffled sound as if you put pillows in the tailpipes. There was no raspiness. Since Flowmaster advertised this as their loudest muffler, I figured the cats on the SSR must really be quieting down the exhaust.

    So, I went to another installer and had a custom Y pipe made and installed in place of the muffler; basically it is wide open after the two cats but it exits at the rear. The sound is PERFECT. It gurgles, it pops when you want it to, and it is AMAZINGLY QUIET comparitively (for no muffler) when you just put-put around. Cruising at 70 is quiet due to the 6 speed. But, when you get on it, it SLAMS. PERFECT sounding exhaust. It's like a canon shot...but quiet under normal driving. And, it has none of the obtrusively annoying resonance that the Flowmaster seemed to add. When I did the muffler delete, I tried various mufflers at the shop...and all of the supposed "loud" mufflers ADDED more interior resonance than no muffler at all! Even race mufflers...they hurt the sound OUTSIDE the vehicle while adding interior resonance. The open pipe after the cats was definitely the way to go for the LS2 in the SSR. So...

    Again, my Trans Am is stock. I have been wanting to do the same thing to this car that I did on my SSR; i.e., simply remove the muffler and have a y-pipe system fabricated to exit out the rear and look stock. I don't want a cut-out, as I don't want the sound exiting underneath the car and resonating more inside. I know the muffler delete works well on the LS2 in the SSR, but how quieting are the cats on the LS1? Will they muffle the sound similar to the way the cats do on my LS2 in the SSR? I was surprised at how tame the LS2 was with no muffler (I mean in comparison to REAL open exhaust, which is deafening) which must be due to the quieting qualities of the SSR cats. If I do a simple muffler delete on the Trans Am, I don't want it to resonate like crazy...and, for a point of reference, the LS2 in the SSR definitely does NOT resonate badly inside with NO muffler.

    This brings me to the Loudmouth, which is basically open pipe after the cats with a resonator. However...how does this "resonator" sound compare with just having open pipes which exit out the rear as I've done in the SSR? Going by my experience above, any time I added a muffler to my LS2 system for comparison it ADDED interior resonance. Would the resonator in the Loudmouth system probably do the same? In other words, would I get LESS interior resonance with straight pipe rather than use the resonator? That has been my experience on an LS2, but I don't know about an LS1 in an F-body. Has anyone tried this or compared the sound of the Loudmouth system to an F-body with a straight pipe that exits at the REAR (not under it like a cut-out)?

    I've checked out LS1sounds.com but I can't find anyone who has compared a Loudmouth to open pipes with stock cats that exits at the rear, nor can I find a comparison of interior resonance of the Loudmouth vs. straight pipes to the rear interior resonance. I know the Loudmouth is known FOR resonating badly in the car. I'm wondering if it will be MUCH less (as it was with my SSR) by eliminating the resonator and running straight pipe after the cats.

    Thanks again everyone! Really looking forward to your responses!



    Sincerely,
    Jeff

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    Pathelogical Liar BlackLT1Z28's Avatar
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    Sorry I can't answer your question on the straight pipes, but all I can tell you from my experience, is that the LM1 sounds mean. I had it on my other LT1 and it was awesome. Definately good quality, awesome price, and a mean sound. Going with the $400 catback would probably be cheaper than having someone fab up straight pipes for your TA. And if you want longtube headers later, then you'll have to modify the current straight pipes to fit the LT's.

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    I guess the $400 Loudmouth price is relative; it cost me $65 to have a custom Y pipe made and installed on my SSR to accomplish pretty much the same thing by what I've researched so far...

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    I've been thinking the same thing,but I would hate to put straight's on and it sound like crap! Somebody has to have tried it.Your right,it would be super cheap,pipes and tips.

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    bump

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