Has anyone bought some thing from demon tweeks and had to pay import tax? How much tax on the dollar? Thanks for your help.

Dante @ Primm Motorsports imports loads of stuff from Demon Tweeks at a time. So he more than likely save you some money.
His site is www.primmracing.com

There's a 2.5% import duty on most auto parts. It's higher on some specific items whose American manufacturers have a large bribe budget. Everybody has to pay, it's just a question of whether you pay it to the shipping company or as part of Primm's markup.

Right, but Primm will usually save you on the shipping. Because he probably gets an entire crate of stuff shipped over at a time. Ive priced a few things both ways(DT direct + shipping vs. Primm) and Primm was alot cheaper.