Sports exhaust fitting

[pat_y]

Was considering putting a sports exhaust on the Cerbie, i have a 4.2 but the exhaust i've seen up for sale is a used 4.5 one and looks like it has decat pipes still attached. does anyone know if the 4.2 - 4.5 zorsts are both the same size/length etc?

[Steve_T]

4.2 and 4.5 decats differ, not sure about the rest of the system.

[Allandwf]

Isn't the bore slightly larger on the 4.5? I'm looking at this also as I think the cats have collapsed on mine, so if anyone has a sports exhaust/decat system for a 4.2 I think you have a couple of customers here.

[Tanguero]

The bore is the same but they are different lengths. The 4.5 cats are an inch or so longer.

[pat_y]

Think i might avoid these then and wait for a 4.2 set to turn up. Thanks for the input chaps.
Just for information it's these i was looking at:
http://cgi.ebay.co.uk/TVR-CERBERA-1999-REG-CENTRE-...

[greenm]

I think I would avoid those anyway looks like the car has been dragged down the road on them without any wheels??

[Allandwf]

Yes..... This is about the 3rd time it's appeared on ebay, started at £125.

[al 350i]

have been relisted at £100 now, the decat pipes are 14" long and they want £20 each + £12.50 postage.
just wanted the decat pipes myself but don't think there fit.

found a couple of old pringle tubes, think there in better condition than this exhaust

[ridds]

I'm pretty sure that a 4.2 and 4.5 COMPLETE exhausts from the manifolds back will fit either car.

I've never heard of a difference in manifold pipe length. The differences are in the centre pipes, as you've got a whole system there it shouldn't make any difference if you have a 4.2 or 4.5. Unless anyone knows any different?

Also, that's not a Sports exhaust as commonly known but a custom built Blue Flame one. You can tell by the cans and the tailpipes.


Also also beaten to st.

[pat_y]

Thanks for that Ridds, although it would beg the question, if the length of cat + rear system is the same for both cars, why make the individual parts different sizes? it's not as if the engine characteristics are that different, if it was an cat size/emission thing just fit the larger/longer cat to 4.2 and 4.5
As far as i remember the originals came from Magnex, very suprised they didn't tell TVR put the same system on both.
Oh well, live and learn, i'm sure someone has a very good resaon somewhere for doing it that way.

[Allandwf]

Was it not something to do with cat approval ?

[Tanguero]

According to TVR Powers parts website - they only sell one size of intermediate pipe to fit both 4.2 and 4.5 so I am a bit puzzled as to where the difference is. Everyone sells 2 different size cats so something must be different. Back box?

[JNR77]

I am still on the look out for a second hand standard back box for a speed six, let me know if you have one lying around in the back of the garage!!

[RichV6]

I may have one if I can identify it. Can you tell me the diameter of the two pipes into the box and the distance between centres. My car is a 4.2 with a 4.5 back box and theres no way this back box I have on the shelf will fit my car.

FWIW I had to internally sleeve the 4.5 back box to fit the 4.2 centre pipes as they are 1/8" smaller diameter, and also slightly reshape the back end of the centre pipes.

[jesfirth]

i think the back boxes are the same size etc but the pipes leading to the centre section are 1/4" larger on the 4.5. This then carries through to the cats so although the pipes are the same length the diameters are different. - I think? thats why the 2 spare exhausts I have dont quite fit each other!

[ridds]

Hmm, very odd. Where's Joo when you need him. He must know the differences.

[Gazzab]

I have a standard 4.2 back box in my garage that I would swap got an equally top condition standard 4.5 backbox if anyone wants to swap.

[Tanguero]

jesfirth said:

i think the back boxes are the same size etc but the pipes leading to the centre section are 1/4" larger on the 4.5. This then carries through to the cats so although the pipes are the same length the diameters are different. - I think? thats why the 2 spare exhausts I have dont quite fit each other!

The cats are deffinately different lengths - about an inch in it, but I cant remember which way round it is as to which is longer. I know this for sure as when I bought my linked de-cat from Joo I had to go under the car and measure it. One is 15" and the other 16" I think.

[pat_y]

ridds said:

Hmm, very odd. Where's Joo when you need him. He must know the differences.

I spoke to Joo last week by e-mail, this week he is on holiday apparently....On the Isle of Wight, something to do with AJP engines and a Griff.

[Gray_101]

I spoke to Joo a month ago, about uping the horses on my 4.2.

He told me my sports pipes are not much good and recomends i change them to 4.5 s from the cats back, he said its a straight swop with no problems

but im yet to try it