DeCat

[VR4CANUCK]

When removing the cat on a VR4 do you remove the two resonators as well or leave them be? When the cat is removed do you get any popping when decellerating?

Cheers

[peter thomson]

No to both questions

[elnevio]

With the standard exhaust system and just a decat, MBC and panel filter, I used to very occasionally get the odd pop from the exhaust when decelerating, but that was it.

[Nick Mann]

The problem is that the injectors stop fuelling when you lift off the throttle and engine brake. So no popping. If you have an atmospheric dump valve it might help? Or very bad turbo oil seals!

I'd leave the resonators in too, they aren't much of a restriction and they help prevent exhaust drone.

[elnevio]

I forgot to mention - I only ever got it to pop when the exhaust was HOT hot, and I'd just been giving it beans!

[VR4CANUCK]

So all I have to do is get my local muffler wizard to custom fabricate a section of pipe to put in where the cat used to be?

[elnevio]

So all I have to do is get my local muffler wizard to custom fabricate a section of pipe to put in where the cat used to be?

Yep!

Or purchase a decat pipe for an Evo 4/5/6.

[Nick Mann]

I bought one from these guys for less than £40 and I was very pleased with it!

http://stores.ebay.co.uk/stormtech-p...i.html?_fsub=3

[VR4CANUCK]

Thanks for the great info as always.

It's DeCat Time!!

Cheers

[roryfromnz]

Mine pops alittle but mostly when im just crusing around. Although ive got a walbro and Rising Rate Fuel Reg aswell as a mines ecu. Ive got a 3inch straight through without cat. Its very borderline too loud!