Anyone fit a cat bypass pipe yet? (Staintune/Arrow) Thinking of trying one with the standard cans. The routing of the pipe going under the engine instead of down the side of it seems much better and will stop the pesky exhaust shield scraping in the righthanders. And perhaps a few more BHP? I think the pipes only £200 or so?
Looks way better than standard more power to I plan to do the same to my S4r when i get it and keep the standard cans first, so I can upgrade a bit at a time
Hi Martin I got my cat bypass + new 45mm headers from www.spareshack.com. They do a type 1 - 45mm headers + cat bypass £356 and a type 2 - cat bypass only £237. I havent had it dyno`d yet to see what the gain is yet but i can feel a huge difference in the torque and some top end, it has also smoothed it out alot at low speeds (around town etc.) I dont know what the difference will be with a std can as i have termis on mine. You can see how it has tidied things up on my avtar.