12 replies to this topic

[ChrisS1]

So who's got the quickest/easiest/best technique and tools for drilling out the precat in an NA downpipe?

 

[The Batman]

Buy a decent stainless steel drill bit. Hammer and big screwdriver lol

[Gedi]

I used to stick them in a band saw and cut them across the middle. The cat lifts out and you weld it back together.

It's a lot faster than trying to drill it out

[jim61]

Big drill bit but keep speed down as low as possible - not easy with a little drill as they stall whereas a big'un will snatch then you do the spinny round thing😬 Find someone who has a large vice( mechanics type not sordid sort :-) Good luck 👍

[ChrisS1]

I've done it previously, just wondered whether there was a better/quicker/easier method

[FLD]

I used snipe nose pliers.  Jam them into the substrate, twist and pull.  Easier than drilling IMO.

[slindborg]

Ask Furtive, and don't do what he did

[Exmantaa]

Cool, cool and cool during drilling! Just a spray flask with water will save your drills and speed up the process. (You can be lucky that the whole thing comes loose; screw a big threaded screw-bolt in the material and pull/lever everything out with that.)

[Rosssco]

[garyyb]

No drilling needed. Screw a 100mm wood screw in to the middle, grab with pliers or a claw hammer and it'll come straight out.

[slindborg]

No drilling needed. Screw a 100mm wood screw in to the middle, grab with pliers or a claw hammer and it'll come straight out.

Not always...

[Haston]

I ended up drilling, hammering and used a chisel took me about 2hrs

[meetntwo]

One 13mm drill bit and small bodywork air saw , takes around 10 mins.