Classic Exhaust backbox

H4YVB · Feb 1, 2020

Hi all,

It sounds like my back box isn't too long for this world, so I've had a trawl around the web for a replacement back box and there seem to be a range of options.

My current system is non stainless, so do any of you have a recommendation for a reasonably priced, good quality back box for a 1994 model, cat equipped Classic?

Thank you!

Datatek · Feb 1, 2020

I don't know about the classic, but Double S do good stainless systems at a reasonable price, a quick Google would find them and others.

discool · Feb 1, 2020

Datatek said:
I don't know about the classic, but Double S do good stainless systems at a reasonable price, a quick Google would find them and others.

Its that the same Double S that the same Double S that supplied the LRO mag to do a feature on a RRc exhaust replacement, LRO found the pipe bends were in the wrong place therefore LRO has remove the bends and fabricated their own it was lucky that LRO has the use of a fully equipped garage, the job took an extra day so they weren’t happy and said so.

Perhaps you never read the that feature as u “don't know about the classic” but i did being being an owner.

RangeRoller dt · Feb 1, 2020

Cat equipped 94 is 3.9 or 4.2 efi V8 ?

type These part numbers into your search engine (eBay, google etc)
there’s loads of options

Esr 1053
Esr 3674
Esr 3971
Stc 3718

I don’t own one.

discool · Feb 1, 2020

H4YVB said:
Hi all,

It sounds like my back box isn't too long for this world, so I've had a trawl around the web for a replacement back box and there seem to be a range of options.

My current system is non stainless, so do any of you have a recommendation for a reasonably priced, good quality back box for a 1994 model, cat equipped Classic?

Thank you!

I had two replacement back boxes and one middle box fitted to my RRc all genuine parts after the original failed that didn’t last long.
When my DISCO’s back box failed after 11 years with out any hesitation I fitted a Janspeed stainless cat back system as a replacement, now 12 years old and has never been touched and never will be.

When I had my RR I had a look a three systems at the LR show in Billing,
Double S had very poor and untidy welding, the Rimmer bros item’s welding was not much better and was light weight and then Janspeed which had perfect and very neat welding and thicker steel, and was fitted with a ‘cherry bomb’ style of back box also stainless, plus the system was just two pieces with flange joints, so not the pushing one pipe into another arrangement and the tightening a clamp to make the exhaust gas tight.

So a perfect instant fit, the hanger points and bend over the axel matched exactly and which took just 3/4 hour in total to fit so I was very pleased

RangeRoller dt · Feb 1, 2020

P38 ones often need brackets adjusting. I’ve had no issues.
If OP has a 300TDI they are about £40-70 for back box

That’s steel though.
SS is for boy racers, Classics aren’t

Kev12 · Feb 1, 2020

RangeRoller dt said:
SS is for boy racers, Classics aren’t

main point of SS is that it lasts pretty much forever, unlike most other exhausts

RangeRoller dt · Feb 1, 2020

Kev12 said:
main point of SS is that it lasts pretty much forever, unlike most vehicles

RangeRoller dt · Feb 1, 2020

Same they say about the platinum in cats. They still get replaced.
Price of stainless you could buy quite few mild steel. My original lasted 20 years but OE is steep too

RangeRoller dt · Feb 1, 2020

Problem is quality of the steel, both stainless and regular. Hard to tell until it’s in your hands.

There’s always 2nd hand stainless boxes about for sale too as they tend to outlast the vehicles

Datatek · Feb 2, 2020

discool said:
Its that the same Double S that the same Double S that supplied the LRO mag to do a feature on a RRc exhaust replacement, LRO found the pipe bends were in the wrong place therefore LRO has remove the bends and fabricated their own it was lucky that LRO has the use of a fully equipped garage, the job took an extra day so they weren’t happy and said so.

Perhaps you never read the that feature as u “don't know about the classic” but i did being being an owner.

As you say, I do not know the Classic, but I have cat back Double S twin rear box systems on 2 P38 diesels, they both fitted perfectly, one has been on for about 7 years now and still looks good

discool · Feb 2, 2020

Datatek said:
As you say, I do not know the Classic, but I have cat back Double S twin rear box systems on 2 P38 diesels, they both fitted perfectly, one has been on for about 7 years now and still looks good

No doubt Double S manufacturing standards have improved as their still in business.

Ratae · Feb 3, 2020

I had the same issues as LRO with that system on my own RRC.
That said, it's been on now for years.
All the clamps supplied with it were mild steel & I've replaced them a couple of times. Same with the olive between the front pipes & the front box.
The triangular clamps that hold those two sections together rusted through last year & I altered a pair of stainless steel ones off ebay to fit - something Double S should have done in the first place.

Henry_b · Feb 3, 2020

janspeed is what i'd punt for..

Had the system on my 3.9 manual, souned epic and was of great quality.

Grrrrrr · Feb 3, 2020

Henry_b said:
janspeed is what i'd punt for..

Had the system on my 3.9 manual, souned epic and was of great quality.

Yes but they are pricey.

Henry_b · Feb 3, 2020

Grrrrrr said:
Yes but they are pricey.

But they last the life of the car.

RangeRoller dt · Feb 3, 2020

Stick a foam panel in with standard exhaust will sound better. Quiet but has the tone. Also pricey for a fancy bit sponge just cut up one of your meguiar ones

norseman · Feb 3, 2020

My last 3,5efi had a nice soundtrack after the rear box on my mild steel system fell off (not for the first time, poor design … lack of a rear silencer bracket) & I replaced it with a length of plain pipe.

Classic Exhaust backbox

H4YVB

Member

Datatek

Well-Known Member

discool

Well-Known Member

RangeRoller dt

Well-Sprung Member

discool

Well-Known Member

RangeRoller dt

Well-Sprung Member

Kev12

Well-Known Member

RangeRoller dt

Well-Sprung Member

RangeRoller dt

Well-Sprung Member

RangeRoller dt

Well-Sprung Member

Datatek

Well-Known Member

discool

Well-Known Member

Ratae

Well-Known Member

Henry_b

Think outside, no box required.

Grrrrrr

Technician, Bodgit & Scarper Ltd

Henry_b

Think outside, no box required.

RangeRoller dt

Well-Sprung Member

norseman

Well-Known Member

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