Tom, Bobboloo - leaving it alone is the conclusion I've come to also. I was considering this to 1) get a set of S stacks for another project, and 2) make my car more original. But as you pointed out, I'd have to go all the way through the heads to retrofit the E specs, which is too much work/$ if I'm not devaluing the car with the S induction. I think I'll just try to get a set of E spec stacks and TB's so I can convert in the future if I have to be in there otherwise.