It's still pretty stock, so whatever the block gets stock is the numbers coming out of it. Yeah the big Rims do slow it down. Cause those rims are the heaviest I've ever seen, weight about as much as a semi tire. But I'm not going to be racing in the damn thing so it's all good. But the sound is my most wanted thing anything that would go along with the exhaust, such as new cam, heads, TBS, and new intake, and yeah I was think about making my own intake. Buy a K&N add a Y in it with two head filters, look and sound good. I got about $5000 budget for the engine. Turbo would be nice, but you got to do so much to add one of those things, and then get the timing right. Which is a pain in the ass.