4-1 Comp Exhaust Fitting

[Casbar]

I've just bought a 4 -1 Comp exhaust from Caterham. i've a 91 x flow. Can anyone advise on how to make the exit hole larger from the engine bay, so 4 pipes can fit through. (Clean answers only please)

 

Robert

[John E]

You may remember that I carried out this mod a few weeks ago. Try a pair of curved tin snips and a half round file. you can cut out reasonable lumps with the snips and then tidy up the edges with the file. I used this method along with some emery paper and the resulting hole is both tidy and with smooth edges. I havnt yet painted the edges but thats a winter job. All you have to look forward to then is making sure that your new expensive silencer does not bottom as mine did.

 

Happy snipping

[Graham Perry]

Alternatively buy an Abrafile (not sure of the spelling) from any DIY shop . Effectively is a very ,very thin file wrapped around a tight wire in a frame with a handle and you can cut in all direction very easily. Don't even think about using a powered jigsaw, as the ali in the area of the exit hole is unsupported and it will catch in the teeth of the saw and bend.

[Glenn Wheeler]

I used a rotary abrasive flap wheels in different grades, this gives great control and smooth edges.

[Pierre Gillet]

You can use a powered jigsaw to cut an aluminium sheet with a piece of thin plywood tightly fitted undernearth the ali sheet so that you cut both the plywood and the ali sheet at the same time. A specific blade with very small teeth must also be used.

 

Pierre