Exhaust is very subjective. I've spent more money on exhaust setups that I didn't like than the average mk2 is even worth. If you are young, you will probably like it loud and obnoxious. I like a car to be quiet and stealthy. Remember that what you are building is like a giant musical instrument. To get a nice sound, the size of the mouthpiece has to be matched to the size and length of the pipes. That ricey sound comes from using a trumpet mouthpiece with baritone pipes. Supra is more of a trombone sized mouthpiece and needs more medium sized piping. Turbo cars can get away with 3" pipes because the turbo is a sort of like blowing through a reed (turbine), effectively turning brass into a giant woodwind instrument, like mabe a contrabass or something (almost worth it for the sound quality alone). The muffler is like a mute stuck in the end of the horn. There are all sorts of styles that create all sorts of sounds. Chambered mufflers are designed to use noise to cancel noise, dividing exhaust pulses and reflecting them back on one another to hopefully cancel themselves out. They can be a crapshoot as they can sound great in one setup and drone on horribly in another with the only difference being slightly different distance from the engine. In any case, they are not so efficient and generally louder. The glass-packed or diffuser type (turbo) mufflers are a safer bet, but lots of variable can set up a drone at certain speeds. Here is what I know I like on a stock supra after spending thousands of dollars. A 2.25" system, high-flow cat, a single-inlet, 2-out 15" magnaflow muffler and a 4" diameter glass-pack halfway between the cat and muffler. That will growl when you romp on it but you can hold a conversation with your passengers and listen to a symphony most of the time.