hey i agree with Gantman :-) i payed roughly 600$ for my custom built torque converter from edge racing.. then 350$ to install. Totally worth the investment.
Im not sure the reason behind you avoiding exhaust but have you looked into electronic cut outs?? They open a valve in your exhaust when its "race time" and allow air to flow out before the muffler therefore creating a straight through exhaust with just the flip of a switch. Then when its all done you can switch it back which closes it and you will have your stock exhaust back. Really cheap and really easy to install
Check out my mod thread!= http://www.ramforumz.com/showthread.php?p=709872&posted=1#post709872
AirAid Intake System, PowerAid Throttle body spacer, SuperChips Flashpaq, Edge RacingTorque Converter, Straight Through Exhaust, Mechanical fan delete, ATI Super Damper, MT Street ET Drag Radial Tires