please explain ?

 

Firstlt retains heat in the exhaust and hot gases move faster than cold ones therfore the exhuast can work more effectively.
Also keeps heat out of the engine bay, reduces under bonnet temps which in turn reduces heat soak into other components, steering rack etc. Especially if you have an under bonet mounted air filter keeps intake temps lower too.

 

perfectly explained, makes me want to wrap up now lol.

 

ive heard about risk of fire ?
also someone told me there car ran worse when down pipe was wrapped ?

 

There is no worthy gain from wrapping a downpipe. Up pipe and headers yes, as was said in an earlier post hotter gases flow faster which help with turbo spool.

 

Rubbish - wrapping a downpipe does help for the reasons said before - especially reducing heat in the engine bay and intake temps by extension as a good portion of it sits under the turbo and alongside the gearbox before finally exiting under the car. My downpipe regualrly gets to 600C +.

 

Before mine [oops, headers & up-pipe] was heat wrapped it was melting everything around it

TX.

 

If anything it would reduce the risk of fire as the outside of a wrapped downpipe would be cooler, therefore less risk of something coming into contact with it and catching fire. Unless of course you're buying some cr*ppy exhaust wrap of eBay which is actually made of paper, not the asbestos type material it's supposed to be

The car will also not run worse, better if anything but I doubt you'd notice.

As far as I know there are no disadvantages to heat wrapping a down pipe and I would do it without giving it a second thought.

 

I recommend you wrap the downpipe, i ran mine unwrapped for a couple of miles and the heat coming into the cockpit when on boost was unbearable last summer... Took it off, wrapped it, back on and all is well

 

Its a flame resistant material, possibly with some sort of fibreglass, certainly annoyed my hands when fitting.

 

Never bothered wrapping mine on my RA or my newage now... dosnt seam to affect power lol

Why do Evo's never heat wrap there manifolds when there directly in front of the engine, anyone know ?

 

Horses for courses, why dont all cars have lsd's? why dont all cars have HIDs etc.
Costs and subjectiveness rule!

 

Because it's at the front then airflow is better.

 

If it made a big power difference they would wrap them surely... its just a question i was thinking after seeing so many without, as most Subaru drivers do

 

Its like most things I suppose, a combination of several little things add to something better?

 

Yeah probably, just always thought why we did and they didnt lol

I heat wrapped headers, up-pipe, downpipe and even the FMIC pipes when i was in a drag race series, but now for a road car i cant be arsed and it dosnt seam to have effected anything, my times might not be as fast but im not racing on the road

 

LOL if you have the time and inclination, go and take it all off, and give the car a hammering, then go out and drive it again and see how different it will feel. Extra heat in the engine bay from remaps, modifications etc will slowly sap responsiveness and top end power.
I had a good sized fmic on my old cupra and the difference in both logging and driving was very noticeable once the engine was hot. With the fmic it only took a few yards driving from traffic lights and the intake temp was right back down to what it should have been, the smic took an awful long time just to drop a few degrees.