Custom exhust setup? Pipe size to use?? - Defender Source
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  #1  
Old November 20th, 2005, 10:54 AM
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James
'94 NAS AA Yellow
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Custom exhust setup? Pipe size to use??

Hi all,

Next year i want to have a custom exhaust made for my Defender (Same as a 4.0 97 NAS).
I want to try and fit a duel pipe system, with a centre box with two inlet/outlets, and keep two pipes running right to the back.

Anyone recomend what size pipe i should use? Is 2.5" too big? Should i go for 2.25"?

Any advice would be great

Thanks

James
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  #2  
Old November 20th, 2005, 06:48 PM
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Mike
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I believe it would be cheaper and just as effective to go with 2.5 - 2.75" single pipe. I looked at this a couple of years back and the gains with duals were negligable and it was expensive. I seem to remember the cats being the major restrictors (could be wrong here) and you could go with high flow cats but they are $$$.
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Old November 20th, 2005, 07:03 PM
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James Falchetto
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James,

I stuck headers on mine (the Heddman's), works great with a single exhaust pipe. I used 3" MS, keeps the rattle and cost down (compared to putting together a whole combo with Stainless). One piece of advice NOT to do is have the exhaust shoot straight through the back, exhaust gases tend to get sucked back in (softop). One thing though the steering column had to be modified, stock one with the big fat collapsible joint wouldn't clear the manifold. So that's something you want to keep in mind. Also those hedders are made for RR not Defender, mine were tight next to the chassis so that had to be trimmed as well.
Overall, sound and performance-wise I can't complain - the large pipes do help in the chilly desert nights around to keep the whole cockpit warm. During the day... well pack more water!

Not a pro in the field but dual exhaust you would have an issue with the X pipe, that would have to be perfectly tuned.
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  #4  
Old November 21st, 2005, 12:45 PM
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James
'94 NAS AA Yellow
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Thanks for the advice guys.

I think i want to stick with the duel system idea so i can have twin exits at the back. Not worried if it costs more, i want it to be right. I have bought some hi flow performance cats to build into the system, and i can get a mid box with a x pipe built in, but i dont know what size pipe to use?

i think i remember reading that 2.25 is the bigest for a duel system, but 2.5 would be easyer for me.

James
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  #5  
Old November 21st, 2005, 12:52 PM
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Phillip
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duals are for the dudes in big CHevies and Fords with super swampers.
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  #6  
Old November 21st, 2005, 01:14 PM
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James
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Quote:
Originally Posted by rover4x4
duals are for the dudes in big CHevies and Fords with super swampers.
Duals look great My Defender is no rock crawler, i'm into modifying it for performance and looks, bling dont get your ass out of mud but it looks good

This is like i want to have:
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  #7  
Old November 21st, 2005, 01:47 PM
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all man that thing again
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  #8  
Old November 21st, 2005, 01:50 PM
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John B.
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Quote:
Originally Posted by Defender50th
Duals look great My Defender is no rock crawler, i'm into modifying it for performance and looks, bling dont get your ass out of mud but it looks good

This is like i want to have:
I guess you don't want to go off road. I'd have that ripped off is 5 minutes.
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  #9  
Old November 22nd, 2005, 12:21 PM
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Mike Hammond
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Quote:
Originally Posted by Red90
I guess you don't want to go off road. I'd have that ripped off is 5 minutes.
Or squashed flat.
Sticking out the back will suck fumes into the cab and fold under if you reverse in thick mud or get it hooked up.
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