quasr

I am stoked after my one day at Rennsport Reunion III. I guess one day is better than none. Lots of great people and the track was open for all groups of cars. I have Bishoff mufflers on my 993 and just purchased Gillet Motorsound mufflers. I currently have Gillet Motorsound tips that fit with the existing donuts. What will I need to marry the Gillet Motorsound mufflers with the exhaust pipes further back? Another set of donuts perhaps? Thanks all.

993inNC

no the gillets should have the "doughnut" built in to the muffler pipe on th cat side.

FisterD

Not correct. Gillets only have the built in doughnut on the "tip" side. On the "cat" side, they are the same as Bischoffs, so they will bolt on the same way.

993inNC

You know, you're right, its the cat that has the doughnut built in.......sorry quasr, my bad
Geez, you think I'd know

FisterD

Sorry Chris, actually that's not right , either. The cat side uses a removable doughnut, on both brands.It's the tip side that's different.

993inNC

no, thats not right, I've seen some real muts that Porsche put out on the late cars. One was really weird and was a complete mix of parts
Maybe it was me building all my pipes with the doughnut built in that has me somewhat confused it has been a LONG w/e though and I'm tired.......no excuse I know

Okay I'll stop now

disclosure........LISTEN TO NOTHING I'VE SAID QUASR.

Good night!

quasr

Thanks guys. I guess I could just take my mufflers off and see what is there. It just means having to order some donuts or not.

quasr

By the way Darin. When I find the Motorsounds are not loud enough, I will be knocking at your door. Thanks.

JasonF

So just to summarize, you can swap Bischoff's and Gillet's freely on the cat side (in other words, the cat connections are the same). The only compatability issue may be with the tips, correct????

Marlon

My car is a 95' and the cat is Bischoff-only. It has donuts just like my mufflers. You could try to plug your Gillette mufflers into it, but you may have a problem with clamping it up???

Maybe you should post a photo of your Gillette mufflers - easy to assess the issue then. But if your Gillette mufflers Bischoff style cat inlets, you should be good to go for hooking them up to your Bischoff cat.

Cactus

Those B's are sooooo shiny!!!!

FisterD

Marlon,
Gillet and Bischoff mufflers mount to the cat the same way...........They both use the doughnut gasket on the CAT side. On the exhaust tip side, Bischoffs use the same doughnuts, but Gillets have the doughnuts built-in. Pretty simple. Look at the pics I posted, the circled part is the "tip" side. The other side (not circled) is the "cat side".
Cat side=same,
Tip side, Bischoff=needs doughnut, Gillet=doughnut built- in.
Switching from Bischoff muffler to Gillet=no doughnut needed on TIP side.
Switching from Gillet to Bischoff=need to buy doughnuts for TIP side.

Marlon

Cool - I was slowly coming to that realization... Do both systems use the same 'clamp'???

Black993

Kinda funny, i was just thinking about how badly I wanted to do exhaust after being at Rennsport all weekend! My car was not nearly loud enough going through the tunnels.

I'd say just skip the motorsound and go loud!

Bill Verburg

Bischof on left Gillette on right


Doughnuts used by Bischof, discard if using Gilette because Gillettes have them intgral to the pipe but only on the outlets


The head connections are the same on all

the header/cat connection is different. Gillette cat(or cat bypass) must be used w/ Gillette headers, Bischof cat(or cat bypass) must be used w/ Biscoh headers.

The Mufflers and tips mat be used interchangeably.