What do people say? "GTR, land of the rising credit card debt"?
Owning and running one properly isn't cheap, it only gets worse
You have a few problems there man.
1) Speakers - more information. Did you only change the speakers? Are they 2ways, do you know they work. Does the cone pop out when you give the wires (pulled from the head deck) 9v from a battery?
2) Rev's - Dude if your engine speeds rising and you ain't gaining knots, then your clutch is slipping. (assuming all 4 wheels aren't smoking) Is it an OEM? How much power you making?
3) Turbo timer - F_cks knows, what one? Set to auto? broken?
I'm putting $100 on your tyres blew cause you were doing burnouts with the ATTESSA relay pulled out, which you did incorrectly and short circuited the turbo timer. This fried your clutch and the smoke damaged your brain, causing you to install pancakes in the doors, mistaking them for speakers.
Cheers