I've just bought a secondhand downpipe for my car, with the intention of doing the wastegate flange thingy mod, you know the one i mean. I'm planning on leaving the cat in place as i only have that one left and i want to pass MOT's.

Will i notice any difference like this or would it be best to loose the cat too?

Any thoughts much appriciated.

Cheers
Comper100

 

What's this wastegate thing all about?

 

You know, when you mill out the flat plate that covers the wastegate opening, so that it breathes better. lots of companys do the mod in various ways but i thought i might have a go myself with a spare you see.

Cheers
Comper100

 

I think you may be barking up the wrong tree with this line of thought. The only reason I could see it necessary to 'mill out' the wastegate opening is if you are suffering from boost creep* and are trying to scuper that.


*Boost creep is where even when the wastegate is fully open boost pressure continues to rise

 

Have a look at this page and its the TSL "Group A" Spec Performance Downpipe that i want to replicate but with the cat in place.

http://tsl-motorsport.co.uk/exhaust.html#c

Basically i want to do this to my downpipe: http://tsl-motorsport.co.uk/exhaust/down1.jpg

Cheers
Comper100