Size of difference is relative to the user. A muffler can make a difference. Anyone who says otherwise is an idiot. Whether it makes a big difference or small depends on how the driver perceives it. If you need proof Silvereclipse i suggest you read on how the internal combustion engine operates and study the scavenging affect of camshafts. 2cyl dirtbikes and motorcycles are proof if you want an example.

Terry
96 Eagle talon ESI
Greddy header - Greddy exhaust

97 Eclipse
Star Stage II - Boost/oil/EGT gauges - 3" custom DP/Apexi N1 3" exhaust - SFMU/return line - Apexi SAFC - Stage 2 6 puck Sprung hub MIBA clutch - Shortened shifter - Koni Yellows w/eibach prokit - Stillen Fr/Rr swaybars - ceramic intake - DEI Keyless entry alarm - Niche 17" Shoks

Waiting to be installed: HKS EVC IV, 450 Turbo injectors, GSX Front brakes (need rotors)