Cats

[Byker28i]

Anyone know a source for these or anyone got any (or one) for a 4.2 cerbera?

I had a lambda sensor down, hadn't time to fix it so drove it to get it sorted. On the way at low revs I think it ran lean as I put my foot down and had a 25 foot roman candle out the rear...

I know I could decat cheaply, but it would make it too noisy for local trackdays (and the miserable neighbour).

Cheers

[thegreengoblet]

Byker28i said:

On the way at low revs I think it ran lean as I put my foot down and had a 25 foot roman candle out the rear...

Byker28i said:

I know I could decat cheaply, but it would make it too noisy for local trackdays (and the miserable neighbour).Cheers

I have sports tails and have recently decatted. It isn't actually that much louder at tick over and low revs, only when you're booting it hard. With only a 100 nuggets or so for a linked decat pipe I'd defo suck it and see. Your money may be better spent on some ACT TD silencers rather than replacememnt Cats (as long as you have a friendly specialist with their own set for MOT times).

[brogenville]

I've actually got one that I bought to get the car through an MOT, but in the end it never needed it (long story, but basically involves an incompetent MOT mechanic). Anyway, its in my garage now, and since its only seen about 200 miles of use, I was just about to put it on ebay. Interested?

[Byker28i]

Yup very please. My email is in my profile. Either way I go I'll probably need them for the mot.

The other option is to go with some linked decat pipes from TCS. At least that will make the cabin cooler in summer.


I've love to go for the full SP system but I can't quite stretch to £1k extra just now.

[brogenville]

Good stuff. Y (will) HM.

[FarmyardPants]

thegreengoblet said:

I have sports tails and have recently decatted. It isn't actually that much louder at tick over and low revs, only when you're booting it hard.

That's interesting GG, ACT + decat. Was thinking about that myself. Could you start up and burble out of a cul-de-sac at 6am without waking the dead? Anyone else run this combo? Was thinking of going the SP box + decat route (have sports tails)..

[RUSSELLM]

From my experience.... In order of loudness

1. Sports + decat (too noisy)
2. Sports + cats (too noisy)
3. Standard + decats (my favourite , normal sound but a nice bark at high revs)
4. Standard + cats (too quiet )

All IMO of course

[Byker28i]

Sports plus cats on my car measures anywhere between 102-104db at the track days I've been on. ACT trackday silencers drops it to 97-98db. It's about right I think and I can burble out the close without making too much noise.

Quite tempted by the decats now. Are the linked ones quieter than non-linked?

[Byker28i]

Oh and I have the ACT trackday silencers - but I'm never too sure what that's doing to the hangers adding weight to the tailpipes.

Anyone tried the cherry bomb silencers to replace the cats that ACT sell?

[petclub]

Byker28i said:

(and the miserable neighbour).

Throw a big party, invite some us along and tell him/her that we're moving in...

I think Hoover has Cherry Bombs on his Griff, but I could be wrong. Dave

[Byker28i]

It's the person who spray painted his fence & and the whole of my car including the interior as the windows were open, one week after I bought it.


He's bought a Porsche Boxster - I think me wearing my t-shirt when it comes will do

http://www.tvrcerbera.co.uk/images/TVR_Because.......

[petclub]

That's a bad pic, I hope it all came off OK, and you told him.

Hmm, Cuprinol Brown Porsche, could look nice .....

[FarmyardPants]

[FarmyardPants]

RUSSELLM said:

From my experience.... In order of loudness

1. Sports + decat (too noisy)
2. Sports + cats (too noisy)
3. Standard + decats (my favourite , normal sound but a nice bark at high revs)
4. Standard + cats (too quiet )

All IMO of course

Interesting. Maybe we should make a table, eg marks out of 100 for:

rear box        system      cats       loudness (idle)   loudness (on song)     overall sound quality
--------        --------    ---------  ---------------   ------------------     ---------------------
std (benchmark) std         std        50                50                     50
std             std         none       65?               70?                    85?
ACT             std         std        60                55                     55
ACT             std         freeflow   65                60                     60
ACT             std         none       75?               85?                    ?
SP              std         std        45?               55?                    55?
SP              std         freeflow   ?                 ?                      ?
SP              std         none       ?                 ?                      ?
SP (boss)       SP          none       55?               ?                      ?

Not very scientific - 'loudness' is particularly cringeworthy - and quality is subjective, but you get the idea. The ?s represent cluelessness , the others are IMHO. Can extend to HP gain, cost etc.

[Byker28i]

Well, I know what my car is recorded at with cats & sports. I suppose I'll have to decat & find out

[touching cloth]

I had Blueflame Super Sport pipes and Decat when we went to the Ring last April and it was effing loud hence being booted and coming home deaf; now have the same decats (straight through jobs not linked) and the SP Backbox and think I recorded a (just on the limit) 102 at Brands, albeit maybe at about 3.5k not the 4k asked for. Happy with that and confident I can get on any 105 days without issue, oh and no questions at the Ring in October. The full SP setup is purported to get down to 98 but the full system uses the linked decat which I guess is why I am still a bit above that. It for me is an ideal setup, quiet when you want but still sounds like you have cranked open the gates to hell at full beans, and it still gives me a selection of tracks I can get on at, as long as I pick the right days.

[Byker28i]

Yup the ideal would be the full SP system, but I just can't quite afford that at the moment

[optimax sniffer]

Byker28i said:

Anyone know a source for these or anyone got any (or one) for a 4.2 cerbera?

I've also got a 4.2 cat if the other one doesn't work out.

[Byker28i]

Cheers - as always - this place is great

[thegreengoblet]

FarmyardPants said:

That's interesting GG, ACT + decat. Was thinking about that myself. Could you start up and burble out of a cul-de-sac at 6am without waking the dead? Anyone else run this combo? Was thinking of going the SP box + decat route (have sports tails)..

I have the standard dealer fit sports back box. Fitted a linked decat has increased the overall volume - she is defo louder than Sports with Cats even at tick over and low revs, but there's not that much in it.

Ultimately I would like the SP back box to go with my linked Decat. I've heard the system and it has a nice rasp to it. However like Biker I too cannot afford the expense this year, so I'll just have to make do.

I have a sound meter so I might just give it a bash tomorrow and see what she's putting out. So how close do you stand to the exhaust? What level? and at what revs?