as above, i just received mine & its got a small 8" exhaust box thingy on it? i was expecting a straight piece of pipe? <img src="/forum/images/graemlins/confused.gif" alt="" />

It can do, to give a little extra silencing, but most are just a straight pipe I think. As long as it is a 'straight-through' design, it shouldn't effect performance greatly, and will still flow a lot better than a cat <img src="/forum/images/graemlins/wink.gif" alt="" />.

Phil

what do you mean by straight through Phil?

this is where i perchased it & it does say straigt through silencer <img src="/forum/images/graemlins/grin.gif" alt="" />

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?V...N%3AIT&rd=1

Can you see straight-through the pipe? A lot of exhaust boxes just have a perforated pipe surrounded by wire wool or something similar, so they allow the gases to pass 'straight-through' but just expend a little on the way. These are best for performance <img src="/forum/images/graemlins/cool.gif" alt="" />.

Cheaper ones may not actually have a pipe going right the way through, rather two sections of pipe next to each other with holes in to let gases pass from one to the other. These are cr*p <img src="/forum/images/graemlins/grin.gif" alt="" />!

Phil

yep can see straight through <img src="/forum/images/graemlins/laugh.gif" alt="" /> lots of holes where the box is in the centre of it! so its ok one Phil?

Should be <img src="/forum/images/graemlins/wink.gif" alt="" />.

Phil

ok cheer mate!

It's a baffle to try to quieten the noise down as the gases pulse through. The supersprint is the same. It doesn't work really thank god <img src="/forum/images/graemlins/smirk.gif" alt="" />

lol cheers guys!

it does work.

the silencing makes no difference to performance, but it just takes the edge of the aggresive sound of an un-sileneced pipe.

<img src="/forum/images/graemlins/smile.gif" alt="" />

Rog - have you now swapped your straight decat pipe for a silenced one?

A couple of weeks ago I was going to re-fit my cat as I thought my exhaust was just too loud, but recently it seems to have got quieter and now sounds <img src="/forum/images/graemlins/love.gif" alt="" /> (although as I mentioned in my post about undertrays, I'm not sure if running without the tray has some how made it sound different <img src="/forum/images/graemlins/confused.gif" alt="" />)

what sort of gains does fitting a de-cat pipe have and is it worth the hassle of changing come mot time

When i bought the Blueflame I asked the same question and was told it helped drown out some sound and make it less obvious that no cat was fitted <img src="/forum/images/graemlins/laugh.gif" alt="" />

Rog is right.

I've got a decat (which is kinda of a 'bullet' design which
is a perforated mini-expansion chamber) , the gains are
still there without the sharpish noise and droning at
motorway speeds.

hey , Rog , haven't seen you posting in a while.

cheers.

<img src="/forum/images/graemlins/smile.gif" alt="" />

How long had the decat been on? Only ask as new exhaust pipes can sound loud until they carbon up a bit and bed in. <img src="/forum/images/graemlins/smile.gif" alt="" />
just a thought.

I had my local exhaust place make me up a straight piece of pipe for £30 fitted i think it was.
Had to put my cat backon for the mot the other day and hated it with the cat back on, quiet and noticed a slight performance difference.
Happily the decat is now back on for that lovely burble.
Took a few weeks to carbon up but get lovely pops and bangs from it now too!!

Dave

I got CSC de-cat for my 20v n/a from Lars @ Gazzella.
Cost under a 100 and a lot cheaper than a new cat.
Rolling road showed it gave me 4bhp top end (191)
and 10lb extra peak torque (175 I think)

Oh, but it did shift my power band/characteristic 500rpm further up the revs, so sacrificed a bit of power lower down

Can you get a cat-bypass that actually looks like a proper cat <img src="/forum/images/graemlins/laugh.gif" alt="" />? So if ol plod stick happen to stick his nose in it would still look right? Surely they would take it off and test the thing incase of an accident... <img src="/forum/images/graemlins/smirk.gif" alt="" />

The police wont but an insurance assessor will. Remember Neil from Greenlight said on here recently that your insurance wont payout if they find out your car is catless. Really not worth the risk IMO. Also kills the seals on your turbo.

Cosmo, he's hardly going to say anything alse <img src="/forum/images/graemlins/wink.gif" alt="" /> Yes if you are caught without a cat you do risk the insurance company not paying out.

cosmo,

is it only cat-less cars that are being targeted/mentioned?

how about chipped cars ?

or those with open-pod airfilter ?

or non-standard wheels ?

I think you see where I am heading here ...

cheers.