why weld in flowmasters? i had that on my car when i bought it, it went from my headers to 2.5 inch bbk h pipe i put on to 2.25 inch stock flow pipes and tail pipes that came on the car. so it was kinda restricting. just get a bbk 2.5 inch off road H and a flowmaster 2.5 inch american thunder cat back and you will be set.