PontiacBonnevilleClub.com

willwren wrote:That was OEM as it game off the donor car, Pat? And the same configuration as the SSEi?

And for the 2003, other than Bosal, was the layout and dimensions the same as earlier 2k's?

yes it was 100% OEM from a 2004 GXP. Every part of the exhaust is identical in fitment as is is to the SSEi

the pre 03's have all the same dimensions. 00Beast its 2.25 out of the res to the Y

Just confirmed that my 89 has 2.25 on the whole system.

myfirstbonnie wrote:Just confirmed that my 89 has 2.25 on the whole system.

Same for both of the 91's here..

Don, isn't the SSE's exhaust a dual outlet crossflow though?

willwren wrote:Don, isn't the SSE's exhaust a dual outlet crossflow though?

On the 87-91 Bonneville they aren't cross flow..

Some Models will only have a single outlet at the Muffy,

Other Models like the SE With Sporty( NC6 ) exhaust will have a Dual Outlet on the passenger side..

Its gets tricky for the 90-91 Models..

The 90-91 could have come with the NC6 Dual Outlet( single side ) Muffy or there is a possibility that you could have had the Fakie Dual Outlet where one Outlet hangs off of the main outlet to present what looks like a Dual Outlet Muffy when in reality its a Single outlet that splits off into a second outlet.. Sad that they did that to the 90-91 Models... A few of them had the real deal and got the true NC6 system

So your 91 SSE doesn't even have a crossflow? I could have sworn they did. I'll use lottavaginamatt's diagram (my own version) for the 87-91's then, with the appropriate dimensions.

All my piping to the muffler is 2.5", the muffler outlets are 2.25". No resonator.

What do you mean by Crossflow?

You have an inlet... Here



And on the passenger side of the muffy a Center Outlet.. On the cars with NC6, you had 2 actually pipes coming out of the Muffler on the passenger side..

Crossflow being inlet and outlet on one end, and another outlet on the other end.

Ok that being said... None of the 87-91 Models used that set up.. Same goes for the Buick and Olds H Bodies as well..

Ok, that clears up alot. Basically the same layout (slightly different path) than the 92+, inlet on the same side of the transverse-mounted muffler, and only one outlet (sometimes two pipes) on the passenger side.

willwren wrote:Ok, that clears up alot. Basically the same layout (slightly different path) than the 92+, inlet on the same side of the transverse-mounted muffler, and only one outlet (sometimes two pipes) on the passenger side.

If you had an 87-91 With NC6 you should have had 2 True Outlets out of the muffy...

Other Models without NC6 could have had a single Pipe of a Single fakie Dual.. I'll get a couple of pics posted shortly..

91 SSE Fakie Dual




91 LE single Outlet

Bumparooni.

Still need some input here.

Primarily with the 95-99 SE/SLE, single and dual exhaust, confirmation on the 2000-2005 SLE dual, and the 2000-2005 SE.

i will measure tonight bill, i know for my SE, res and back is all 2.25"

OEM exhaust configuration/sizes
Year: 1996
Engine Code: L36
Model/Trim: SE
Cat inlet diameter: 2.5
Cat oultet diameter: 2.5
Resonator inlet (if equipped): 2.25
Resonator outlet (if equipped): 2.25
Y inlet (if equipped): N/A
Y oulets (if equipped): N/A
Muffler inlet diameter: 2.25
Muffler outlet diameter: 2.25
Tip PIPE diameter (measure at the last round section if squared at the end): 3.5
The stock tip was 2.25
This is the back of the cat where it reduces to the resonator (2.5 down to 2.25)

This is the back of the resonator where it is welded to the pipe, no change in diameter(2.25)

This is the inlet side to the muffler (2.25)

This is the outlet side of the muffler (2.25)

If there are any specific areas you need photos of, please let me know.

willwren wrote:Bumparooni.

Still need some input here.

Primarily with the 95-99 SE/SLE, single and dual exhaust, confirmation on the 2000-2005 SLE dual, and the 2000-2005 SE.

I have verified the 2000-2005 SLE dual is the exact same as the SSEi. Goes from 2.5 into the resonator, 2.25 out, narrows to 2.0 at the y-pipe to twin mufflers. I got on my back and crawled under there and measured it, so I know it is the same. Soon not to be on mine.

00-05 se is just like the 96 se from roadtech....2.5 in/out for cat. 2.5 in res/2.25 out. then 2.25 the rest o-the way

Are you sure Juan? I was told that for 00-05 Se its 2.25 in/out for the cat. I'm not positive but I heard that from members on here. I'd like to know what it is due to the fact I need a CAT badly!

OK Mr.Wren here's what I have 99 SLE L36 (not sure if the muffler is stock)

Cat In: 2.5" Out:2.5"
Reson In: 2.5" Out: 2.5"
Muffler In: 2.5" Crossflow Dual Out : 2"
Tips In: 2"


Muffler Body Dim: 6 1/2" x 12 1/2" x 26 1/2" Oval Crossflow with Dual outs

my 87 SE which i think was only available with the LN3? had the following:

Year: 1987
Engine Code: LN3?
Model/Trim: SE
Cat inlet diameter: 2.25
Cat oultet diameter: 2.25
Resonator inlet (if equipped):
Resonator outlet (if equipped):
Y inlet (if equipped):
Y oulets (if equipped):
Muffler inlet diameter: 2.25
Muffler outlet diameter: 2.00 Dual
Tip PIPE diameter (measure at the last round section if squared at the end): 2.00 Dual

This one appearently had the NC6 option. This is not the original system but a complete system replacement that i bought for it several years ago. (car is long since gone) Long before i knew about a bonneville club or anything. i just replaced what it originally had because i liked the original exhaust rumble.




This is for sale, if anyone is interested.