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Exhaust insulation


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Bear in mind that wrap is a pain in the backside - it absorbs water (esp. offroad) and mud which can lead to steamy windows offroad, and a rusty exhaust more quickly if it's mild steel.

Oh and the glass strands stick in your hands when you're working on the vehicle.

I bought a set of tubular headers with it on, not fitted anymore :rolleyes:

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Bear in mind that wrap is a pain in the backside - it absorbs water (esp. offroad) and mud which can lead to steamy windows offroad, and a rusty exhaust more quickly if it's mild steel.

Oh and the glass strands stick in your hands when you're working on the vehicle.

I bought a set of tubular headers with it on, not fitted anymore :rolleyes:

Good wrap should be silica based, not fibre glass so you shouldn't get any glass stuck in hand syndrome ;)

I run Thermotec header wrap from the dump pipe of a the 300Td all the way to the back of the t/case and it works well.

To waterproof it you either use their silicon based aerosol sealant paint, or if cheap like me use a silicon based high temp paint (I had some matt black stuff) and give it a liberal going over with that.

Mines been on for 40,000km now and still looks fine.

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Fair enough, and to be honest I'd rather run a good ceramic based coating to reduce temps but I had rolls on the shelf left over from racing days many years ago, discussed the potential problems (eg potential fatigue cracking) with an ex-marine diesel fitter that told of the extensive use in the big marine diesels he worked on (from the turbo's back) so went ahead and wrapped the dump pipe.

Made a huge difference to heat infiltration into the cabin (what I was mainly after) and reduced a little noise too from the 3" pipe.

Interesting to note that when talking to a 4wd exhaust system manufacturer here, they accidentally discovered a side benefit from ceramic coating the dump and 3'of exhaust on a turbo diesel, they picked up 5 or so HP on a Nissan TD42T with a 3" dump and exhaust.

They backed to back this to confirm.

Seems like the increased velocity downstream of the turbine helped evacuate the gasses a little better, just as it's claimed in a naturally aspirated engine primary header tube.

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