DIY Exhaust Mod – Gain of 10+ HP!!!

[chipmunk]

I see no reason why you can't drill anywhere along the pipe, as long as you are still within the middle compartment and your drill bit is long enough. I drilled roughly in the middle of the bend. I first created a notch with a screwdriver and then used a 6mm drill and worked up.

For info, I have just ordered 20mm and 25mm drill bits and will be amending my video so you can compare the difference in sound between the smaller (10mm, 13mm, 15mm) and the bigger holes.