Just a thought that popped into my head, which turned into questions.

1) Is an Holset HE351 turbo more efficient or make more power than an Holset HX35W?

2) Can you retrofit an Holset HE351 turbo in a 2nd Gen HO 24v truck, or are there ECM issues to deal with?

3) If yes to question #2, would there be an advantage to installing aforementioned turbo over an aftermarket turbo?

4) Rather than bother putting in a new turbo, is there a 4" downtube that you can put on an HX-35W, rather than the stock 3.5"?

Just thinking about exhaust down the road. That, and I have too much time on my hands.

Thanks for the replies.