Undercar exhaust exiting ahead of rear wheel

[HealeyRick]

Originally Posted by Tom Wells

Lippy,



Spintech made the mufflers for me. Their stock ones proved a little too wide and made one of the world's loudest rattles. After they made some for me about 3/4" narrower, they've been on there ever since. They are not SS so they are coated.

I have SS headers and pipes. This was another series of learning experiences, as the routing and fit of the pipes needs to be done correctly. If they're hanging down a bit too low, well, let's just say it makes a noise that's a lot louder than a rattle!

The pipes are 3" all the way. If you have a smaller engine (mine's a 521) you could likely use 2-1/2" and not eat too much hp.

There's a standard rubber hanger (sort of elongated O-shaped) just before the exit bend, holding onto the the pipe using a piece of 3/8" rod welded onto the pipe, and a similar hanger under the frame.

I would have taken them out to the back bumper to make it quieter on 400-500 mile days, but there wasn't any space for the tailpipes.

Enjoy,

Tom

My Austin-Healey probably has one of the least amounts of ground clearance on a production car. When I did the small block Ford conversion, I really had to search for a suitable muffler that would save me from tearing out the exhaust system on any kind of bump. I went with the Spintech Cruiser series, which looks a lot thinner than the model you have. They measure 2 1/4" thick and come with oval inlets up to 3" Here's the link: SpinTech Cruiser Series - Mufflers - Street Mufflers - LOW PROFILE STREET MUFFLERS - 7000 CRUISER SERIES OVAL OR ROUND COLLARS - SpinTech Performance Mufflers

Here's what they look like on the Healey:



I have 2 1/4" pipes on a 345 crank horsepower motor. You can also see the self adhesive DEI Reflect A Kool aluminum covered insulation that I installed above the mufflers: Reflect-A-Cool 010460 | Purchase DEI, CryO2, Ny-Trex, Boom Mat & SPA Turbo Products | Design Engineering, Inc. - Thermal Performance Products

And this is what the mufflers sound like:



(The system is a dual system with the right side pipe crossed over behind the axle to give the look of the stock twin pipes)