ATR fits all cares older then 96 not newer. You can change to a 3.25 flange pretty easy though. The difference is decent on a stock car. With a DP and cat back it will level the torque curve a lot. Drives more like an NA. As for the throttle body they also make a good size difference on a modified car. But save your 240 dollars till you have done everything else. Oh before people say TBs don't make a difference, I saw a decently modified Volvo show a 9hp gain at 5300 rpm for myself.