Subaru Conversion Exhaust Design, Need advice/input Options

[TonyAKAVW]

One of the last remaining things to figure out with my Subaru conversion is how to do the exhaust. I have a few restrictions that make the exhaust design more difficult than normal.

1. I want dual exhaust pipes to exit just on either side of the license plate (through the bumper)

2. I want the exhaust system components (mufflers, crossovers, etc.) to be mounted above the level of the axles. I'm putting a diffuser under the car eventually and need all the space I can get. So no mufflers or tubing below the transmission.

3. I have a set of primary tubes that I bought from Outback Motors that I really want to use as my 'headers.' They are good because they extend below the engine the same amount as my modified oil pan.

So thats pretty much the unusual requirements I have. The difficulty I see is geting any kind of crossover from each side of the engine. Seeing as how I have primary tubes that collect each exhaust port within about 6 inches, I'm wondering if I will gain much by having a crossover at all. Anyone have insight on this?

Also I'm looking for ideas on isolating heat from the rear trunk. With exhaust components mounted up high the heat will really radiate into the trunk. Some ideas I have come up with include: suspended metal heat shields below the trunk as in the OEM heat shield, wrapping the parts with insulation (since they will pretty much never see water this might work well), thermal insulation on the inside or underside of the trunk. Any interesting ideas would be appreciated here.

Finally I'm looking for muffler(s). from the 3 requirements I have I need something small. Reasonably loud is okay, but this will be a daily driver, so nothing that will overtly piss off the neighbors.


Any other ideas or suggestions on the design of this exhaust system would be welcome.


-Tony