dr_whigham

iTrader: (49)

Hey guys. I figured I'd run a few ideas across the board and get a good basis of opinions before I jump....

Car is an 01 SS M6

!Air (04+ LS6 Valley), !AC

TSP SS 1 7/8" LT's, TSP SS ORY, SLP LM1 (Original design with the welded resonator) SLP Lid, P&P Epoxied TB, blah blah blah. Full Bolt-on car minus a pulley.

As we all know, and has been beaten to DEATH on the boards, LM1 + ORY + LT's = Holy-****-that's-the-worst-sounding-slap-in-the-face-I've-ever-heard-in-my-life sound at around 2100-2600. You guys call it rasp; I prefer "rap." It's like a playing card in a rear bicycle spoke, only hooked up to AC/DC's concert speakers.

Enough jokes.

I've got about 3 or 4 different ideas and I'd like to get some input here to see what you guys think.

All options will involve cutting the damned 2.75" piece off the TSP ORY and welding a 3.5" reducer to end of merge and out to the I-Pipe to either 3", 3.5", or 4"

Option 1
Replace I pipe resonator with a straight 3" piece of 16g (.065) 304 stainess tubing, thus making a regular run of the mill 3" I pipe.
Insert a Magnaflow Magnapack #10416 (4" case, 2.5" inlet/outlet) in each tail pipe, for a total of 2

Option 2
Same as above, but using a 3.5" I pipe and reduced back down to 3" before she goes over the axle, and use the 2.5" Magnapacks in each tail pipe.

Option 3
Same as above, but running a 4" I-Pipe reduced back down to 3" before over the axle, and use the 2.5" Magnapacks in each tail pipe.

Option 4
Use a 3.5" I pipe and reduced back down to 3" before over the axle, but inserting a Borla #40946 16"L x 4.5"tall x 7 7/8" wide oval muffler, 3.5" inlet / 3.5" outlet in the I-Pipe. Think oversized BorlaMouth.

Option 5
Running a 4" I-Pipe reduced back down to 3" before over the axle, and using a Borla #40948 16 x 4.5 x 7 7/8 Oval muffler, 4" inlet / 4" outlet in the I-Pipe. Think over"kill" BorlaMouth.



All options should be around the same price, whether I'm running dual MagnaPacks or a single Borla Oval. The only reason I want a Borla is because the oval mufflers are only 4.5" tall and should offer more of a "bassy" rumble to them.

As far as changing the diameter of the Y pipe, the Pat G thread with the custom Y is where I got the idea for the 4" I pipe reduced back to a 3" over-axle. Bottom line is I have to cut the 2.75" piece off the Y merge and weld a 3.5" reducer anyways. It's just up to me which size I pipe / what route I take.

The whole point of doing this is I limped along with the LM1 long enough waiting on TSP to make their duals in stainless, and it's looking like it might take a while yet. This is just to get me by until they come out.

I know I could make it easy and just convert to a regular MagnaMouth or BorlaMouth, but I want to be a bit different.


Oh, and just to throw a wrench in all of it-

Trade the MagnaPacks for Stainless Flowmaster 10's.



Thanks for keeping up through the long read, and I appreciate your feedback.

98blueSS420

iTrader: (1)

I have flowtech 1 3/4 Lt's, a Y with high flow cats, and LM1. I dont have any horrible noise issues at any rpm's, other than at WOT! Noticed that you're running an ORY.....maybe you might wanna try a set of high flow cats?

dr_whigham

iTrader: (49)

Cats? What are those? LOL.

I know a lot of it comes from the ORY, but I hate cats with a passion and refuse to run them.

Blk98Vert

iTrader: (2)

Neither of those. The merge on the TSP y pipe is good. If you want it quiet run a copy of the powerflo setup. Swap the LM1 for a Borla XR1 and place 1 before each exhaust tip.

dr_whigham

iTrader: (49)

Agree with the merge being good..... Just not the 2.75" part.....

'00_Z

iTrader: (3)

Seems like the magnapacks would be a tight fit back there but might be cool in option 1. Out of all of them option 4 seems the best as far as ease of fabrication though why 3.5" vs 3"? Just curious.

dr_whigham

iTrader: (49)

This is where I got the idea from for the 4" I pipe. This is Pat G's Y pipe.

Only difference is I don't want to run a cut out, as I feel the LM flows well enough as is. Mine would have a muffler in the cut-out location. I believe Pat put a cut out on b/c he kept the SLP dual/dual.

Blk98Vert

iTrader: (2)

Just keep the exhaust the way it is. You won't gain anything with the bigger I pipe unless you run a cutout buy you already have a LM so there would be no point

dr_whigham

iTrader: (49)

Would the bigger muffler sound deeper? Say, the Borla oval 3.5 or 4"?

I agree that for ease of fabrication keeping the 3" I-Pipe would be easier....

Let's say I have a cam in the closet that's going on in 2 months or so.

It's a 229/236 .631/.631 112+2

I'm thinking the 2 magnapacks would have a cleaner sound vice the 2 flowmaster 10's. Thoughts?

JUSTINSWS6

Lm1 sound like crap sorry if i hurt anyones feelings but i will only tell the truth.

'00_Z

iTrader: (3)

The bigger muffler will have a deeper tone than the resonator, but I don't know the difference between it and dual magnapacks. I think the magnapacks will sound better than the 10's. With that cam it's gonna sound sick regardless.

MikeWS6

All ory setups have rasp

dr_whigham

iTrader: (49)

That's the purpose of this thread.....

Kinda the direction I'm leaning now as well. The fabrication doesn't scare me nor bother me. I just want a really clean sounding deepish exhaust, emphasis on clean.

No.... no they don't. If guys can kill rasp in a ORY and GMMG set-up with just an inverted power stick, I'm pretty sure 2 Magnapacks in the tails will do some good too.


Thanks for the comments so far guys.

Blk98Vert

iTrader: (2)

Like I said earlier run 3 mufflers

dr_whigham

iTrader: (49)

I thought about that, but I don't want my car to be "magnaflow catback" quiet. I want to kill the rasp, but don't want to kill the volume, if that makes any sense.

Seems to be the way to go would be the 2 Magnapacks in the tails.... Just toying with different ideas; Trying to get 3rd party opinions.

99Bluz28

iTrader: (35)

Just go with 2 Magnaflow #12866 at the rear, it's not going to be too quiet not with a ORY-pipe and a cam in the near future. If it still just a bit to much then put a Magnaflow #14419 in the I pipe.

JUSTINSWS6

To kill the rasp get a better y pipe. Wont eliminate but will make it better...

99Bluz28

iTrader: (35)

With the passenger side rear 2.5" pipe I'd get under the car and take some measurements to make 100% sure if you're going to have any muffler case to body clearance issues. The driver side is easy, plus you have the easy option of putting a oval muffler in the stock location. Btw, the #10426 and the #12866 will be very close in there effectiveness, but I still think the 12866 will work a little better. Another option is to use either a MF#11376, or #14377 both are 4x9 ovals and are offset on the same side on both ends. With these mount them were the 4" is the width and the 9" is the height. the height should fit within the recessed area to the left and right of the storage area stump(body bag area). You will need to measure to verify the fitment. I would also suggest if you go this route to spray over that recessed area on each side with a couple of coats of high-temp paint(+500) .

http://images.magnaflow.com/02product/parts/14377.jpg


FYI, the purpose of the 4" I-pipe on PG's exhaust is to allow maximum flow through the cut-out, that's why he reduced it back down after the cut-out.I really don't think he would have done it that way without the cut-out in that location.
PG, please correct me if I'm wrong.

MikeWS6

I honestly havent heard an ory with out rasp.

99Bluz28

iTrader: (35)

Usually it's just Y-pipe merger that's the problem; or lack of.