I need help with my exhaust for my 3W 200cc engine. A friend and I are trying to get my exhaust stacks just right and have welded and rewelded twice and it still doesn't come out identical on both side of my 1/4 scale DS F4U-5N Corsair. Someone recommended cutting the pipes and putting in a flexible tube on each side and then clamping the top stacks the same to a block of hardwood where it wouldn't be seen so they are identical. What sources do I have for a tubing that will withstand the heat generated by my engine? The pipes are 3/4" ID. I have to see what the OD is before I buy any tubing.

Please help,

Gibbs