Decat or sleeve

[dantvrgriff]

Hi,

I know this has been discussed in the past but still seeking your advice. I own a Griffith 500 (97) and even though the car is fast I feel the engine is not really wild. I have removed the precats - sleeved 1/3 of the silencer but would like more sound and throttle response. I would prefer to keep the main cat due to MOT every year and for the sake of the environment. I am wondering how much decating the car really brings - does it react quicker and does it feel more alive ? - else I will simply sleeve more of the silencer - would you recommend sleeving only 4/5 or the complete silencer.

Cheers

Dan

[Doc Toad]

Hi Dan, this thread is a bit old but it covers the options...

http://www.pistonheads.com/gassing/topic.asp?t=112...

Not sure you'll get what you're after without some extra work on mapping though? Be careful mate, you are setting off down a very slippery slope!

[clive f]

if you want the engine to breathe and be more responsive then decating is the only way to go.

[FlyingGriffith]

Mine is standard with pre cats out and the clive Y fitted. revs more freely, sounds as it should. takes 5 mins to put the cat on for the mot, and 5 mins to swap back when cooled down. Plenty of mot stations will pass a decated car for a few £££ mine use the previous mot car to do the emission test before backing it out of the garage (so it gets tested twice lol).

Video - https://www.youtube.com/watch?v=LeTGcKwSG4g

[StarmistBlue400]

A sleeve thread and no mention of Tug Boats

[dantvrgriff]

Thanks for the feedback - it seems decat is the way to go. How can I get hold of a Clive Y-piece - would anyone have one for sale ?

Cheers,

Dan

[lockhart flawse]

I wouldn't mind one as well........

[mk1fan]

Contact Clive F via PM on here or Facebook.

Alternatively, ebay.

ACT also do a replacement Y piece. Perfomance wise, I'm not sure if there's any difference between the Clive F and the ACT. Looks wise, if the Clive F is Cindy Crawford at the height of her modeling career then the ACT is the frothy bit that collects around the edges of the mouth on a 100 year old with no teeth.

[977]

Ask Clive - he's 3 posts up. Or you can get him on his facebook page:

https://www.facebook.com/clivefppa

Which is probably easier than the antiquated pistonheads messaging system.

I've got one of his decat y pieces - can't comment on performance improvement as I swapped the engine management out at the same time but when you see what you're taking out... I can believe it makes a difference.

[dnb]

It is worth sorting out the induction too. The air intake and plenum is really restricted as standard.

[Chuffmeister]

Decat.

Had sleeved with cat, sounded good. Sleeved with decat way too loud. Decat with standard silencer, pretty good, still loud, but less agricultural. I'm going to try semi-sleeved/ cherry bomb style with decat next time.

[bananaface]

im fernhurst "sports" backbox (Sleeved )and full decat.
it sounds epic... in addition i have the stepper motor disconnected and run on 95 ron.
these things together have made the car just amazing.
its personal preference but personally i love, crackly lopey cam sounding v8s that crack on upshifts and spit flame on overrun !
One mans tugboat is another mans dreamboat

[Chuffmeister]

I had exactly that. I agree over 3k it sounds Epic, but I felt as if I'd been to rock gig after an hours driving!