Any experience is the optimization of exhaust converting the standard SS exhaust system into a 1 5/8" exhaust with a 4into 2 into 1 system? What is your thoughts? I have a good SS sytem that I wish to keep for my 2.257 project. I am convience with Chris' data regarding the inporvement in his exhaust system. Can the SS heat exchanger be removed and the exhaust pipes changed for the larger pipes with a 4 into 2 into 1 system following the heat exchanger?
Thanks,
L. McChesney

I thought Chris was working on a header with heat now...

Geoff

It really doesn't matter what diameter the pipes are, the long primaries of a stock type HE system won't give the performance benefits no matter what "header" you attach to it, compared to a true 4-2-1 merged header with short primaries.
I suppose with the larger 1 5/8" tubes as you suggest, they would work better than the stock size, on a large displacement engine.
I have delivered two of my systems with a small heat exchanger add-on. 914rick was the first, and he just received his new engine last week. It still remains to be seen just how effective my HE's are. They certainly won't produce as much heat as the stock or SSI heat exchangers though. You gotta decide what's more important: getting there fast or getting there warm.