Fitting GSX-S750 Decat link pipe
GSXS750 Stock Exhaust Headers
The GSX-S750 exhaust system appears to be 4-1 system, but upon cutting it, it can be seen that it is not a true 4-1 as the pairs are split for a couple of inches
The diameter of the main pipe or end pipe of the exhaust is a restriction at 43mm (1.75″) limiting the engine to a maximum of about 120BHP
And the Cat itself is both quite restrictive and heavy
Fitting GSXS750 Decat link Pipe
Decat vs original
Firstly remove the slip-on from the rest of the exhaust.
Then under the 3 bolts holing the radiator and move the radiator forward a few centimetres (use a rag to prevent damage to the fender)
The headers can then be removed (8 allen bolts) and the whole system removed from the bike
Mark and then cut the exhaust tune around the cat (Cut 35mm from the rear of the central world mark)
The cat is double lined so you need to cut through two layers of pipe (Hacksaw or angle grinder) didn’t take long with a hacksaw
Then just pull the pipe and cat away and out the headers
The welds on either side of the existing large pipe need grinding or filing down to ensure the decat pipe fits securely
Then just slide the decat pipe over the existing pipe, do not tighten the clamp yet, refit the headers and slip-on and when everything is aligned tighten the clamp. Fitting GSX-S750 Decat
Reattach the radiator.
The decat pipe is 50mm and fits directly to the existing slip-on without the gasket
Ride and enjoy, to improve the perfomance of your GSX-S750 further flashing the ECU makes a huge difference to the response and power.