P38 "dual exhaust" came and went through the years and I'd be willing to bet it really was looks only. Before I changes out my exhaust I had the rear silencer removed and straight piped. It makes for a nice round tone but is not at all intrusive even at highway speeds.

 

Hi, I seem to remember reading somewhere it was to do with sound levels, here in the States the requirements for noise control are getting more stringent every year, though nobody seems to say anything about single chamber Flowmasters on old Chevy trucks! Go figure!

 

Hell, just put some side exit pipes on it, AKA old Corvette, and be done with it :lol:
I see no problem with converting it to a single outlet myself, if it would help you offroad etc.
I must admit to liking the looks of the twin pipes myself, but could never be bothered to do anything about it with my single exhaust system.
Martin

 

Hi, I seem to remember reading somewhere it was to do with sound levels,

yep... the rear boxes are just silencers... which actually work quite well. Just cut em off.

 

The problem with the twin pipes for those U go offroad, besides the clearance to the ground, is that the exhaust don't create sufficient back pressure on both sides and if you enter backwards on the mud you will end up with 1 pipe clogged.

interesting, is this because of the way the exhaust is routed in the RR or does it apply to all twin outlets (i guess it depends where and how far back that branch is) I''m not particularly impressed with the exhaust either (single or twin) it looks like an after thought and routed anyway it could, really frustrating when you have to drop the cross member to change the cat's

 

Good question!! I'm sure i read somewhere from an authorized member (maybe the french LR Tech Instructor) that LR changed that exhaust design in order to reduce heat on the rear right airspring

 

Good question!! I'm sure i read somewhere from an authorized member (maybe the french LR Tech Instructor) that LR changed that exhaust design in order to reduce heat on the rear right airspring

My passenger side rear airspring is about 2 mm from my exhaust pipe (with no silencers). I figured I would have problems with heat/rubbing, but the rubber looks untouched, even after 5 years.

 

Good question!! I'm sure i read somewhere from an authorized member (maybe the french LR Tech Instructor) that LR changed that exhaust design in order to reduce heat on the rear right airspring

If that were the case why did they go back to single? The only reason I think it was look is the transition from hidden single exhaust to exposed tip dual and then back to hidden single.

 

Good question!! I'm sure i read somewhere from an authorized member (maybe the french LR Tech Instructor) that LR changed that exhaust design in order to reduce heat on the rear right airspring

If that were the case why did they go back to single? The only reason I think it was look is the transition from hidden single exhaust to exposed tip dual and then back to hidden single.

When did they go back to single ?

 

Good question!! I'm sure i read somewhere from an authorized member (maybe the french LR Tech Instructor) that LR changed that exhaust design in order to reduce heat on the rear right airspring

If that were the case why did they go back to single? The only reason I think it was look is the transition from hidden single exhaust to exposed tip dual and then back to hidden single.

When did they go back to single ?

Just what I was going to ask!

I too read somewhere that it was purely to reduce the noise levels in the US. It actually makes the engine less efficient because of the rubbish T joint.

 

Guys, reduce noise levels in the US :lol: Are you serious?

Even the 95 and 96 P38 sounds less than any american V8.

 

Hi,
Well i heard that was related with reliability issues but i don´t know how, perhaps lower EGT.. I believe that could be because of the sound, make more sense, luxury car and so, people don´t want to ear the engine at all.. (must of them) Well, I will put a single pipe in there and see what happens :lol:

Regards

 

The fact that you have a diesel makes sense. IIRC Land Rover had a problem of heat on those diesel rigs and that's why they move to twin exhaust.
Looks like petrol owners wouldn't have understand why the diesel has 2 exhaust (wich means more power for many people :lol: ) and their V8 only one. :roll:

 

From what I remember reading twin pipes on later P38's were introduced for European noise regulations.

On the single pipe systems, removing the rear silencer box makes a negligible difference in noise IMO, the rear silencer box rust easily, I had an exhaust shop make up a new rear pipe and tuck it up as high as possible for off road use, however the heat and proximity to the rear plastic bumper cover probably does not do much for the rear bumper (plastic becomes very brittle).

For off road use the center silencer heat shield can get banged up, and the heat shield rattles - solved with large jubilee clips to hold the heat shield securely in place.

 

I had an exhaust shop make up a new rear pipe and tuck it up as high as possible for off road use, however the heat and proximity to the rear plastic bumper cover probably does not do much for the rear bumper (plastic becomes very brittle).

For off road use the center silencer heat shield can get banged up, and the heat shield rattles - solved with large jubilee clips to hold the heat shield securely in place.

Any photos of your setup?

Thanks

 

I had an exhaust shop make up a new rear pipe and tuck it up as high as possible for off road use, however the heat and proximity to the rear plastic bumper cover probably does not do much for the rear bumper (plastic becomes very brittle).

For off road use the center silencer heat shield can get banged up, and the heat shield rattles - solved with large jubilee clips to hold the heat shield securely in place.

Any photos of your setup?

Thanks

taken with my cell phone

 

i've been thinking about getting rid of my dual exhaust lately. i know a guy down in Wyoming who i have had do about 4 cars for me who does excellent work. I've been thinking about going to larger pipes off the cats and then tie them together before they hit a muffler, then straight out the back. i'm thinking 2.5" pipe would do the trick pretty well. then i won't lose to much back pressure, and it'll stay quiet.

anyone have any good pictures of their exhaust systems?

 

I had an exhaust shop make up a new rear pipe and tuck it up as high as possible for off road use, however the heat and proximity to the rear plastic bumper cover probably does not do much for the rear bumper (plastic becomes very brittle).

For off road use the center silencer heat shield can get banged up, and the heat shield rattles - solved with large jubilee clips to hold the heat shield securely in place.

Any photos of your setup?

Thanks

Better photo

 

Hi,
That is exactly my idea
Thanks

 

What best to add a nice V8 note ? Middle box removal or a new air filter unit -without loosing gas mileage ? for my '02 4.6HSE

 

i have a 2.5 diesel................i have removed the cat and all silencers.....and its a road car......the noise level is only a tiny bit louder than b4

 

So both box removel will not add much ?

 

From when I briefly moved the vehicle, still with cats but nothing after suggests it would be substantially louder.

 

I have been thinking about chopping the CATs off and running dual pipes all the way back.
Put an X-pipe somewhere in the middle. I think I can get the pipes tucked up pretty high, better than stock for sure.

Pipes don't get nearly as hot with no CATs.

 

I really want the double note of V8. Do i have to split it to get than after removing mufflers to attain this ?