Im getting my tax return before the end of the month, hopefully. I gotta pay bills and shit but ill have about $500 to put into my car. Its pretty stock right now, i have a 2004 v6 3.9l mustang. It is a manual. All ive done is intake and Magna flow cat back. I was thinking i would do a T-lok (or a 8.8 rear) and gears or Long tubes and H pipes, or something else? Looking to do something that will make a difference, any suggestions