Originally Posted by Condore21

If you are N/A then buy the 2.5" DP, if you are supercharged then buy the 3" DP.

Option 1:
For ease of installation, buy the 3" bolt-in with cat.
For long lasting durability, buy the 3" 304SS bolt-in w/cat

Option 2:
Don't know if the O2 extension harness is necessary for the MC's.

Option 3:
For ease of installation, buy both front and rear gaskets

Option 4:
It is always good to keep your stock DP in case you ever want to go back to stock.

Option 5:
Standard Model


Now all of that is fine and dandy, but before you got dropping money on this, like mentioned above, ask yourself where do you want to take this car mod wise? If you want to drop pulley sizes and build it, skip right over the DP and go with headers. Best bang for the buck and you will only have to do the exhaust one time.

Originally Posted by zipper

The reason that he should skip the 3" d/p is because headers automatically come with a d/p.