Main cat removal....
Discussion
AFAIK if you just remove the cat from the existing Y piece the effect, whilst very loud, is also a bit tinny and too bassy.
Your best bet would be to buy something like a new ACT de-catted Y piece (approx £220). This would not only look better as its stainless steel but also sound better as it has a narrower neck. Plus it'd mean you could keep your existing Y-piece for MOT time.
Your best bet would be to buy something like a new ACT de-catted Y piece (approx £220). This would not only look better as its stainless steel but also sound better as it has a narrower neck. Plus it'd mean you could keep your existing Y-piece for MOT time.
Cheers zippy and andy..... Andy, just reading other post about popping etc... Looks like we are both after a little more noise for the summer....
Zippy... What difference would be heard by removing the pre cats as well as main one. Would it be worth the extra effort in your oppinion or will the main cat make a big difference???
Zippy... What difference would be heard by removing the pre cats as well as main one. Would it be worth the extra effort in your oppinion or will the main cat make a big difference???
loud!!! 
going on at the weekend. Never liked cats anyway!Mad Mitch said:
Zippy... What difference would be heard by removing the pre cats as well as main one. Would it be worth the extra effort in your oppinion or will the main cat make a big difference???
In my experience it didn't do a lot at all! Some people say theres a huge increase in noise but all I found was it gave a very small increase in depth of noise, ie/ a deeper rumble - but not by much.
The rear box conversion is what really made the difference, something I had done about 2 mths after the new manifolds.
I've also looked into the main cat removal - seriously considering going down the ACT route but can't quite convince myself to do it just yet!
Well IMO just getting the straight through silencers is about right, Austec had a griff there which must have had no cats at all and was too loud! Never thought I'd say that but wouldn't want to be pulled by plod all the time just because they heard me coming 2 miles away! You can keep things at a reasonable level if you dont floor it when the BiBs are around with the straight through whilst turning heads dwon the other end of the high street if you stay in gear for long enough should the coast be clear.
When I had a Chim, I removed the precats (well they mostly removed themselves) and replaced the main cat with a 200 cell free flow sports cat from Blackthorn Catylist. Even though I didn't sleeve the main silencer the sound was glorious as the new owner would tell you. I'm sure if I had sleeved the main box then the sound would have been ear spliting. I had no problems with the MOT's at all. In fact the emmissions were very low indeed.
zippee said:
AFAIK if you just remove the cat from the existing Y piece the effect, whilst very loud, is also a bit tinny and too bassy.
Steve,
I agree with zippee. When I removed my main cat it just sounded 'hollow' with a very pronounced 'tappet' noise - not very nice at all!
I'd also suggest going down the JP/ACT route, if you want to improve the sound after decatting, rather than just removing the main cat - otherwise you'll just be disappointed with the result!
FWIW mine's fully decatted, with a sleeved back box, and I don't think it's too loud at all - even on long runs
No Cats !!
3" system, straight through all the way, single 3" back box
4.0ltr chim mota no longer in a chim any more, but you'll get the idea
http://homepage.ntlworld.com/wyn1269/
3" system, straight through all the way, single 3" back box
4.0ltr chim mota no longer in a chim any more, but you'll get the idea
http://homepage.ntlworld.com/wyn1269/
This might give you a better idea of what it might sound like on the move.
Same car but a drive by this time!
You can make it sound as loud as you like still, just adjust your right foot lol
http://homepage.ntlworld.com/wyn1269/
Same car but a drive by this time!
You can make it sound as loud as you like still, just adjust your right foot lol
http://homepage.ntlworld.com/wyn1269/
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