I hada Houston Tuned 21-7bt......fastest most powerful engine I have ever seen, I paired it with a 2013 pipeset and it was just ballistic, WAY too much for me for sure, it was a TON of engine, but very easy to tune, very consistent.......just too much for me personally, I like the plus4 best out of all the Novarossi engines I ran last year, and I ran A LOT of them
