Reading the regs for Hillclimbing, it appears the road going class must have a cat if the car came with one. So that's my idea of a decat gone. It's a widetrack Prodrive STI so unless it's been changed at some point, it should have the Prodrive sports cat.

How restrictive is it and should I replace it with something newer/better? If so, which?

 

The Prodrive cats are very good and should not restrict your car too much really.SJ.

 

Could you realistically achieve 400bhp (other mods allowing) with one on?

 

My car is at 410bhp with a prodrive sports cat, however it wont go any higher till I fit a decat.

 

That's not so bad then. What other mods do you have?

 

Hi mate, my car has:

inner wing induction kit, K&N rc2530 filter
fuel pump
800cc injectors
ported headers
Harvey up pipe
MDX321T
prodrive cat
TSL group n back box

Still on the tmic.