Exhaust - should I replace myself?

[slammedkustom]

the foam creates a hot zone and a cold zone. the area below the engine bay is hot but the area in the engine bay is cooler.
you really need to fit it back asap, i reckon it got hot and the valves have closed up a bit.

 

[Mike F]

Cheers Chris - have bought one today from Volkspares. The old one would have fallen out on the road had I tried to put it back.