centre box replacement

**offtheclockuk** · Wednesday 16th February 2011, 22:55

hi all,

Im toying with the idea of removing the suitcased size silencer in my t5 exhaust, using the tailpipe off a 740td, looks a similar diameter in the klarius book at work, but was wondering if anyone had actually done this mod on the cheap?

something like this http://cgi.ebay.co.uk/VOLVO-740-940-...item439d2f97d2

if you know what i mean?

ta, James

**Quicksilver** · Thursday 17th February 2011, 17:46

I'm looking to do this as my centre box is rattling, something has come adrift inside it, I was thinking of a piece of flexable tubing, you can get it on E-bay for £20 for one metre.

Let us know how you get on.

**offtheclockuk** · Thursday 17th February 2011, 19:11

yeah, no probs, was looking for a cheaper solution than that even, also im not sure on the radius of the bends you can achieve with this flexy stuff.

might have to find a bit and see what its like.

ta, james

**offtheclockuk** · Friday 25th February 2011, 19:25

Originally Posted by Quicksilver

I'm looking to do this as my centre box is rattling, something has come adrift inside it, I was thinking of a piece of flexable tubing, you can get it on E-bay for £20 for one metre.

Let us know how you get on.

right, its done, took a combination of an intermediate and tail pipe off a 7 or 9 series turbo and some imagination, (cheers andy).

i got hold of some flexy pipe through work but you cant get anywhere near a tight enough radius of bend to do the job.

be prepared though, its LOUD! a fair bit of resonance too at 2 to 2.5k in the revs, but cameron likes it, does sound good if you mash it.

ta james

**cameron** · Friday 25th February 2011, 20:40

I'll 2nd the sounding awesome bit

James booted it from my work and it sounded amazing, im doing the same as soon as mine is back on the road, for £60 its a steal

**claymore** · Friday 25th February 2011, 20:49

This thread is useless without a video

**Tomcat** · Friday 25th February 2011, 20:54

Originally Posted by claymore

This thread is useless without a video

Ditto....Oh and Lee....where the hell have you been?.

**cameron** · Friday 25th February 2011, 21:16

Lack of tinternet, busy working etc etc

No excuse i know

**offtheclockuk** · Friday 25th February 2011, 22:19

ill get a vid as soon as light and weather permit, probably idling first

james

**T5frankie** · Friday 25th February 2011, 23:02

mine aint got one or a cat now just a small box near the rear nice and meaty

**offtheclockuk** · Friday 25th February 2011, 23:06

Originally Posted by leighkaicraigmia

mine aint got one or a cat now just a small box near the rear nice and meaty

does it drone at all mate?

ta james

**kee1173** · Friday 25th February 2011, 23:22

this may be a silly question but doing this, does it affect or better the performance ?

**cameron** · Friday 25th February 2011, 23:26

I'd imagine it would let the engine breath better, so maybe earlier spool up etc

I dont think people upgrade to cat-back exhausts for nothing, it must improve it, surely ???

**kee1173** · Friday 25th February 2011, 23:34

Up grading the exhaust i understand, but just wondered by de catting and having smaller boxes, does this help but i think it must as you say less restriction but just wondered does it do much or in other words is it worth doing for performance

**cameron** · Friday 25th February 2011, 23:38

IIRC i think the Jetex cat-back gives about 10bhp, from asking about.

Other brands im not too sure on.

**kee1173** · Friday 25th February 2011, 23:41

will upgrade mine when the old one goes, but was just wondering about also having a de cat and how much diff that makes, may go for a custom made 3" stainless one done but will have to see how pennys go, also wife only letting certain upgrades be done when needed LOL

**cameron** · Friday 25th February 2011, 23:45

Join the club matey, my mrs is the same

Not sure if the car would go through the emissions without the cat on it, i know mine didnt with a knackered cat ( it was basically hollow ) so i had to replace it.

Maybe that was just my car, it did have the HLM 304 ecu in it, if it fails again i'll try it with a standard ecu.

**kee1173** · Saturday 26th February 2011, 01:03

when it goes thru emmisions you need a nice running car behind it and a sympathetic tester LOL....I did nt say that mind you LOL...got a lot of plans for the R but will have to be done as and when, at the mo just want to get it on the road..going for a general overhaul and mot on monday..so prob be gone for a few days but cant wait to satart using her ... luckily tho still got the T5 to use but will be up for sale next week ready for the R...

**T5frankie** · Saturday 26th February 2011, 11:31

Originally Posted by offtheclockuk

does it drone at all mate?

ta james

suppose it does drone a bit on the motorway but its only my weekend car now

**T5frankie** · Saturday 26th February 2011, 11:32

Originally Posted by kee1173

will upgrade mine when the old one goes, but was just wondering about also having a de cat and how much diff that makes, may go for a custom made 3" stainless one done but will have to see how pennys go, also wife only letting certain upgrades be done when needed LOL

cats are very restictive i mean take for instance when you de-cat a classic impreza it gives you an instant 45 bhp