How much back pressure?

[kevo66]

Looking for zorsts for the trackshed (ph1 172)

Seen an OMP one thats cheap but its just pipework untill the back box.

Does the 172 need much back pressure or would this exhaust be OK?

 

[Gray]

That will do

May be a touch loud though

 

[kevo66]

That will do

May be a touch loud though

Thats the other thing mate, I need to pass the noise regs

I would just get a yozza but its a cheap ghetto track car project

 

[Big Bob]

Think the 172's run best with as little back pressure as possible ie. none

 

[Luke.]

my 182 has no cat, no middle section just a 3" pipe to the silencer smooths out the 5k kick and its not to loud on the inside but outside is a different story! think it will still pass most sound regs though!

 

[Jay Payne]

ours only has a middle silencer and a very tiny cat where the back box shold be. 95db

 

[kevo66]

ours only has a middle silencer and a very tiny cat where the back box shold be. 95db

What make is it mate?

This is a group N one, doesnt state the noise in dbs it makes tho?!

Dont want to buy it and it be too loud

 

[Jay Payne]

NWP decat, Prospeed centre section, Tony@Burpspeed rear section (Cat)


Was all guess work

 

[kevo66]

Hmm, I dunno what to do now. Suppose I could always get some glass wool in it if its too loud?

 

[theduck]

Risk it for a biscuit!

Saying that, is it the Ebay special?

 

[Nick172Cup]

My sytems a 2.5" all the way through (decat also) with a small backbox and mine makes decent power all day long, though its definately over 98db!

 

[sideways danny]

172s love bigger exhausts, unusually for an NA engine. droopy donkey dick tailpipe will help keep the noise down. If you want to be flash....get a re-packable backbox

 

[kevo66]

My sytems a 2.5" all the way through (decat also) with a small backbox and mine makes decent power all day long, though its definately over 98db!

Sounds like this one Though it does say its group N/A???? And the Group N limit is 98 db

172s love bigger exhausts, unusually for an NA engine. droopy donkey dick tailpipe will help keep the noise down. If you want to be flash....get a re-packable backbox

I cant afford flash lol, needs to be cheap and effective, looks dont matter

 

[sideways danny]

well the cat makes a big difference to noise, and the ph1 twin cat is actually not very restrictive at all, so i'd keep that and whack on a 2.5 inch cat back

 

[kevo66]

well the cat makes a big difference to noise, and the ph1 twin cat is actually not very restrictive at all, so i'd keep that and whack on a 2.5 inch cat back

Really? Thats interesting to know mate

 

[Fred@BTM]

suspersprint 63.5mm race system with cat did 100db (static!) at bedford today

 

[kevo66]

suspersprint 63.5mm race system with cat did 100db (static!) at bedford today

That pass then? Whats the DB limit there? Bloody loud that with cat!

 

[Fred@BTM]

101db static!

 

[kevo66]

101db static!

 

[Matteh]

mines straight through, decat and no centre sections to a mk1 magnex backbox

passes all noise tests ive had

 

[Ali-j]

well the cat makes a big difference to noise, and the ph1 twin cat is actually not very restrictive at all, so i'd keep that and whack on a 2.5 inch cat back

So the twin cats are alright then, If we just stick a cat back on it would it be not that disimilar to one with a decat? Just less noisy.

 

[Fred@BTM]

^exactly

 

[Ali-j]

Sweet, think this could be the favoured option then boys

 

[AlexG]

Has any one ever tried altering the rear part of a ph1 cat like they do on a 182 cat? The rear part of the twin cat looks tiny and really restrictive.

 

[kevo66]

Has any one ever tried altering the rear part of a ph1 cat like they do on a 182 cat? The rear part of the twin cat looks tiny and really restrictive.

links to 182 cat mod?

 

[Fred@BTM]

^no, walk before you run kelvin

 

[kevo66]

^no, walk before you run kelvin

Sowy:dapprove:

 

[Si]

you've heard mine, Kev. That's just a back box. OMP. bwarp.

 

[Russ_16v]

Rofl ^^

My blueflame cat back came in at 91 db, perfect for me, passes track regs and with what im doing there is going to be enough noise from the front

 

[sideways danny]

you've heard mine, Kev. That's just a back box. OMP. bwarp.

yours is nice actually