new muffler

**V8MUSCLE** · 02-08-2010, 06:58 PM

im putting lt headers and ory on soon, but i have a slp loudmouth catback.
ive heard the loudmouth rasps with LT's. is there another muffler i can just swap with or do i need a whole new catback.

im debating getting a e-cutout and a quieter muffler, that way ill have the best of both worlds.

**V8MUSCLE** · 02-08-2010, 09:46 PM

will the slp loudmouth 2 get rid of the rasp?

**Mr. Luos** · 02-09-2010, 12:41 PM

Originally Posted by V8MUSCLE

will the slp loudmouth 2 get rid of the rasp?

Short answer....no.

Magnamouth.

**kool-aide** · 02-10-2010, 01:57 PM

i thought some of the rasp was due to the y-pipe design, a parallel merge vs. anything more like Siamese or perpendicular. Look at the SLP vs. like pace setter or others. You can see many merge where the gases collide right into each other. Is that true? I thought I read the flowmaster y-collector was great, low cost, and allows you to build a y-pipe where the collector merges parallel instead of close to perpendicular.

So if the collector has any truth maybe you could reduce your rasp by changing y-pipe designs. I figure since you are adding LTs soon, maybe that would be a good time to get a y-pipe fab to fit your needs.

I could just be off my rocker and talking out my butt. I am sure the experts will stop by and set it straight.

**V8MUSCLE** · 02-10-2010, 06:50 PM

im in the process of installing LT's now. i bought a BBK header/ORY combo. i already have the slp loudmouth catback. idealy i just want to change the muffler/resonator with a different one that will fit. if i have to ill sell this catback and get a different catback.

**mpfranks** · 02-10-2010, 07:27 PM

Originally Posted by kool-aide

i thought some of the rasp was due to the y-pipe design, a parallel merge vs. anything more like Siamese or perpendicular. Look at the SLP vs. like pace setter or others. You can see many merge where the gases collide right into each other. Is that true? I thought I read the flowmaster y-collector was great, low cost, and allows you to build a y-pipe where the collector merges parallel instead of close to perpendicular.

So if the collector has any truth maybe you could reduce your rasp by changing y-pipe designs. I figure since you are adding LTs soon, maybe that would be a good time to get a y-pipe fab to fit your needs.

I could just be off my rocker and talking out my butt. I am sure the experts will stop by and set it straight.

you are 110% correct.

cheap y's like pacesetter increase rasp. a nice merge may not eliminate all of it, but it sure helps.

**Mr. Luos** · 02-10-2010, 09:46 PM

Y-pipe is one of the main culprits. With the LS1's firing order, it creates a weird flow and rasp comes out.

**V8MUSCLE** · 02-11-2010, 04:38 AM

the rasp is mainly when letting of the throttle and the engine is coming down from higher rpms right

**Mr. Luos** · 02-11-2010, 08:20 AM

Originally Posted by V8MUSCLE

the rasp is mainly when letting of the throttle and the engine is coming down from higher rpms right

Not when I have the SLP stuff...
It was raspy anytime it was running aside from idle.

**WS6 > SS** · 02-12-2010, 12:34 PM

Scratch SLP LM's off the list. Would the proflo's be any different?

**goof4080** · 02-15-2010, 03:12 PM

Originally Posted by WS6 > SS

Scratch SLP LM's off the list. Would the proflo's be any different?

my slp powerflo's don't rasp. it's an LM2 with 2 additional powerflo muffs before the tips.

and it's getting louder. 2500 miles later.

**JaycenK** · 02-15-2010, 06:31 PM

New mod for the LM1 & 2 I was planning on doing this soon after I finish up my 383 build. I have LT's, ORY and a LM2
http://www.slponline.com/view_produc...85&BIG=31085-4

**texas twister** · 02-16-2010, 03:02 PM

maganaflow

**TA98** · 02-23-2010, 11:38 AM

Originally Posted by texas twister

maganaflow

Agree

**jiveass** · 02-25-2010, 04:17 AM

GLASSPACK FTW!!!!!! LOL

**JoshuaGrooms83** · 02-25-2010, 11:19 AM

I say that on the LLP y-pipe the merge is really nice. They have a siemese merge, not a "slam one into another" style like pacesetters. I still have a little rasp from not having cats, but other than a little at mid rpm, the note is pretty smoothe. Im thinking about getting magnaflow muffler my self now too. But i like mine alittle loud but not like SLP LM.
heres what my LLP ORP looks like. Their cated ypipes are very simular

**Y2KPewterSS** · 02-25-2010, 02:07 PM

Originally Posted by JoshuaGrooms83

I say that on the LLP y-pipe the merge is really nice. They have a siemese merge, not a "slam one into another" style like pacesetters. I still have a little rasp from not having cats, but other than a little at mid rpm, the note is pretty smoothe. Im thinking about getting magnaflow muffler my self now too. But i like mine alittle loud but not like SLP LM.
heres what my LLP ORP looks like. Their cated ypipes are very simular

I like the looks and merge of that pipe.

**JoshuaGrooms83** · 02-25-2010, 02:27 PM

thats one of the reasons i got it. That and for $175 on eaby, stainless the way to go baby

**kool-aide** · 02-27-2010, 10:16 AM

Originally Posted by JoshuaGrooms83

thats one of the reasons i got it. That and for $175 on eaby, stainless the way to go baby

how does it sound? Does it add too much rasp? Did you get their headers too or just the ORY?

**JoshuaGrooms83** · 02-28-2010, 08:15 AM

Originally Posted by kool-aide

how does it sound? Does it add too much rasp? Did you get their headers too or just the ORY?

I only got the LLP ORY. My system rasps a little, i think thats cause im missing cats. From what i gather, i guess most ory will create "rasp". Im guessing that the merge on the y has alot to do with it. If some one cuold point out how to pu a sound or video clip on here ill put it on here to demonstrate my system i have right now.Then when i get my HF cats on, ill tkae another sample of sound and see the differnce.