Exhaust replacement

[hop234]

Hi all,
It looks like our 91 NH { just bought}, needs a new exhaust system.
Is there a better system than the orginal, or is is it best to leave it standard?
thanks
natali

[MITSIR]

Hello,

There are always better Things than Original, it's just are you willing to pay more for it.

You can always throw in some Extractors in which will improve your performace mostly on take off, bigger piping aswell won't hurt, especailly if your replacing the whole exhaust system or are you just replacing the rear Muffler.

[bounceferret]

I changed the exhaust on my NH a few weeks ago. 3' piping all the way through, extractors up the front and a decent flowing muffler. The difference is actually quite good. The best thing about it is a bit more torque, it doesn't have to switch between high gears all the time when attempting a hill greater then 5 degrees (stupid autos )

the piping was done for $100 but the extractors can get a bit pricey, in upwards of $400 for a new set. I bought mine for 150 off ebay

[nj swb]

Most exhaust specialists recommend a 2.25" exhaust for the 3.0 Paj, to help retain bottom end driveability. I bought a 2.5" manifold-back system from a friend, and think take-off has suffered slightly. Same friend replaced this system with a new 2.5" system including extractors, and concluded the extractors weren't worth the money.

This also fits with advice I've had from a 4x4 specialist with over 15 years of Pajero experience - he said he'd tried extractors on numerous Pajeros, and didn't believe they were worth the money.

The factory system has a massive crimp right before the O2 sensor - you MUST lose that!

Good luck,

Scott

[baldyjoe327]

i put a 2.5 inch from the cat back with only one muffler and it goes a lot better on and off road,and sounds good to.

[Jaydee]

Same friend replaced this system with a new 2.5" system including extractors, and concluded the extractors weren't worth the money.

This also fits with advice I've had from a 4x4 specialist with over 15 years of Pajero experience - he said he'd tried extractors on numerous Pajeros, and didn't believe they were worth the money.

What ones did he get tuned or interference ?

and were they all EFI motors ?

[CRH]

A three inch exhaust on a Pajero is way too big. You would have gone backwards in drivability for sure.

These motors are tuned for lower down torque (hence the difference over a Magna) and a big exhaust (more than about 2.25" will kill that.)

I can't be sure, but I would be surprised if you could find tuned headers for a Pajero, they really are for high revving modified motors.

Any advantage headers might give over just a free flow exhaust the right size would be hard to feel on a stocker.

[bigbear]

set of headers from repco $450
2 1/4" pipe / magna flow cat / triple flow muffler & resignater as close to the end of the system as possible (to loose the drone) $770
pipes work extremly well, athough the headers were put on buy myself as i had cracked manifold and they were cheaper.
i don't think i got much power gain but it seems to build revs alot quicker than before, much more usable when needed.
oh! didn't mention before but i have 3.5L nl lwb.
have to agree 3" pipes on a 3L would be way overbord

[Jaydee]

I can't be sure, but I would be surprised if you could find tuned headers for a Pajero, they really are for high revving modified motors.

There'd be a set of pipes somewhere for the humble V6.

Motors don't have to be high revving modifieds... cutting along on open roads with a stock motor would allow them to work and would show up in fuel efficiency.

[CRH]

Jaydee, take a look at the Genie website below.

This is the link for the FAQ page where there is a quick description of the use for tuned length headers.

http://www.genieheaders.com/FAQs.html

When I worked there, there were very few tuned length designs, mostly for 308 commodores and 302/351 falcons and were not recommended for stockers. There is also the issue of room for them too. Not alot of room in that engine bay to route tuned length pipes. The outlet flange will give a good idea of optimum pipe size, and it is 2.25" for the Paj.

[King Of Sideways]

G'day guys i am in the throws of getting a new exhaust as well i have been quoted $320 installed for a 2.5" sports system with bigger barrel muffler i have a 3.5lt NJ wat do you think and any ideas of wat it will sound like i want it as beefy as possible

cheers LONGY

[welshmogsy]

King

I'd like to hear if you went for the 2.5" system and how it goes now?

Thanks

Rich

[Paj man]

The 2.5" systems are good for the pajero's.

I have a high flow muffler and high flow cat and paid 600 for a full stainless. There is the option of going straight through with the muffler which will increase the sound but you need to be careful with the law

[welshmogsy]

The 2.5" systems are good for the pajero's.

I have a high flow muffler and high flow cat and paid 600 for a full stainless. There is the option of going straight through with the muffler which will increase the sound but you need to be careful with the law

Paj man - was that $600 for the whole system including extractors? Could you send me the details of where you go it? Thanks

[ARGS]

+1 - my zorst is rusty as a wreck on the beach and sorely in need or replacing..

by the by, what would it cost for a full 2.5 just out of mild steel rather than stainless etc? Not after anything fancy..