Mack E7 Straight Pipe Sound - 1.45

Version 2.0 Changelog:
Basically rebuilt the whole mod
Included 3 stages jake brake
Included idle jake brake system
Supported Mack SuperLiner by Dielingwu

Feature:
Mack E7 250-460hp engines with straight pipe sound
Detailed sound in engine, exhaust, turbo
Extra feature for more realistic sound