I purchased an exhaust mock-up kit from Aircraft Exhaust, Inc. It includes exhaust stack stubs, a 4 into 1 collector and instructions. I got the PVC pipe and fittings from Lowe's.
The PVC tubing and fittings are somewhat larger in diameter than the stainless tubing which will make up the actual exhaust system. This gives a little extra clearance in tight fitting areas.
All of the primary tubes should be of equal length.
The left front cylinder (#4, blue tape) is the furtherest from the collector so it sets the minimum primary tube length. All of the others have to include extra bends to achieve the same length.
It is important to leave sufficient clearance around the tubes to allow for engine shake and to prevent unwanted heat transfer. Radiation heat shields may be necessary in a few places.
Although I intend to use a battery/starter-only system, with no alternator, I still want to leave space for the alternator if I ever change my mind. Here the alternator is installed to check for clearance. This added a little complication to the challenge. I think I am getting pretty close to satisfying all of the requirements. I still need to work out a short (6" to 8" long) tail pipe and plan the mounting tabs and brackets. Aircraft Exhaust will recommend where the joints will need to be added to avoid cracking.
All of this took about 2-1/2 days and lots of PVC pipe!
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