The full BIllet DTT is on order (finally) and i am having some custom pump work to the little 160 done the goal is 400 450 hp on a single. And that brings me to my question i want twins eventually and i am definalty planning on a piers kit. however the budget wont allow the transmission, twins, pump work, exhaust, and rearend (locker) that i am planning to do all at once. So i want to get a single that downt the road will still be compatible with piers kit later on. i know the one that is commonly used is the hx 40 but i dont think it will flow enough air for my fuel and i want something a little stronger. I was looking at the 64mm htb2 will it work with piers piping and an an ht3b, or what about jr adkins little schwietzer. If not what will all opinions are welcome thanks alot. Joseph