[b]Ernie:

I normally uise the plain blue RTV for a couplle reasons. One, it's the most common and easiest to find, and two (the main one) it's the least expensive and I'm cheap.

Two ways to form a restrictor in an exhaust pipe that wont come loose and fall off. Put a steel bar in a heavy vise, sized about 1/2 the diameter of the pipe. Then use the bar as a mandrel and using a hammer, just peen the end while turning the pipe on the mandrel.

The second way, if you have full access to the pipe all around, is using a tubing cutter with a very dull cutting wheel. Instead of cutting the pipe the wheen will bend a circumfrential groove in the pipe. When it's as far in as you want it you can cut the pipe normally at the outlet end of the groove, or right in the bottom of the groove.

I'm working up a post/thread about making inlet stacks for any engine, not just Saito, I show the peening with a mandrel there. If it's unclear here, and you can't wait, I'll post on it here.

Bill.