Coast Fab mufflers

[Jeff Alton]

I have searched and seen some posts about a couple of people running these, but no comments from the actual car owners after install.

Bill has posted that he thinks they pass sound at a lot of tracks, anyone else confirm?

I have B&B headers on my 3.4 and need a quieter light weight solution that what I currently have (M&K GT3 Style). I was thinking about a pair of the Coast mufflers....

Cheers

[vmax]

I have the 12" version bolted to SSI headers(heat exchangers removed). Make sure you get the Stainless Steel packing--the fiberglass packing will burn out in one event. If you have shorter headers you can fit a longer model. I don't thnk that the Coast/Burns mufflers would be quieter than the M&K. The GT3 style is supposedly not as loud as the 2 in 2 out and R models. I think you could add a single outlet on one end of your M&K and angle it down instead of back. Cap off the center outlets when you need to run quiet.

[304065]

Jpachard is your man, seek him out here.

[TimT]

I have coast fab mufflers on my 3.2 914/6. I usually pass sound at Lime Rock. Although on some days depending on atmospheric conditions I haven't passed and been black flagged.

This is the set up before installation. I made a crossover for the car

[Jeff Alton]

Originally Posted by vmax

I have the 12" version bolted to SSI headers(heat exchangers removed). Make sure you get the Stainless Steel packing--the fiberglass packing will burn out in one event. If you have shorter headers you can fit a longer model. I don't thnk that the Coast/Burns mufflers would be quieter than the M&K. The GT3 style is supposedly not as loud as the 2 in 2 out and R models. I think you could add a single outlet on one end of your M&K and angle it down instead of back. Cap off the center outlets when you need to run quiet.

My muffler is way louder than the standard MK 2 in/out. No comparison. Your solution would requre 2 additional outlets as apparantly the two banks do not mix in the muffler.

Cheers

[Jeff Alton]

Tim, how much do you think the crossover helps reduce sound, or does it at all?


Cheers

[dd74]

I had the M&K Shorties which were similar to the Coast mufflers pictured above. The Shorties were horribly loud and obnoxious for a street car. If you're at all concerned about noise, I don't think this is the route to go.

[TimT]

I don't know if the crossover helps with sound at all. I had the fittings laying around so I welded it up.

On my 911 I have an early M&K RSR muffler, which Ben made with zero baffling. It is loud. Note that I dont drive my cars on the street they are track only.

This is the solution I came with for Lime Rock. Ben supplied the cap, turndown, and baffle. I was just up at Lime Rock for two days and didn't have and problems triggering the db meter. I rev my car to 7800-8000 rpm. the stock M&K howls at those revs . The baffle cap and turn down it sounds like a street car

[mb911]

Originally Posted by vmax

I have the 12" version bolted to SSI headers(heat exchangers removed). Make sure you get the Stainless Steel packing--the fiberglass packing will burn out in one event. If you have shorter headers you can fit a longer model. I don't thnk that the Coast/Burns mufflers would be quieter than the M&K. The GT3 style is supposedly not as loud as the 2 in 2 out and R models. I think you could add a single outlet on one end of your M&K and angle it down instead of back. Cap off the center outlets when you need to run quiet.

He is using B&B setup so a very rare style gt3 muffler that IS NLA

[Jeff Alton]

Ben, what can i do to quiet it down some??

cheers

[mb911]

to be honest here is your best bet.

georges european headers to the size you like then you can choose all kinds of different mufflers and are not stuck with the design B&B has and stuck with a propriorty muffler.. Just my thoughts and the reason why we never made production conversion B&B mufflers only the few prototypes

[Bill Verburg]

A cross over tube helps noise abatement some. The longer and wider the muffler the less noise.