De-Cats and noise - suggestions

[p27549]

I currently have a set of individual de-cat pipes fitted to my 993. The noise is a little loud. I have been advised that the cat quietens the gas flow by the aid of the catalyst and also due to the gases crossing over each other in the catalytic converter. My question is has anyone taken a failed standard catalytic converter and removed the cores to make the pipe an un restricted unit offerering the same free flow as the the de-cat pipes but with hopefully reduced noise.

Anyone have a point of view on this? Benefit - no benefit? Was thinking of 100/200 cell cats but trying to do it on a budget.

Cheers

TIM

 

[jmspear]

I have std boxes and decat pipes, when I do a 100db max day at Castle Combe I use the extra silencers that Merlin at CC sell, these are mated to a stainless pipe with a flange on the end that then bolts straight on as a relacement for my tips. The cost ~£50 per can from merlin and £50 for the two pipes / flanges and hey presto a 98 / 99db car for quiet days and then std tips with cat bypass and std cans for all other days (CC noisy, oulton, bedford, goodwood etc). About as cheap as you can get, you can do quiet days and have that lovely sound when not at a quiet day. Prior to this set up I had a Cargraphic NGT set up, bigger bore, sport boxes and 100 cell cats and I still needed the extra silencers for CC quiet.

HTH John