Melting/bulging rear bumper.

[GT3.My]

After tuning the car (it was running rich before), I've noticed that the bits of the bumper surrounding the tailpipes have started to melt, approximating an appearance much like melted cheese. Also, the driver's side (RHD) side of the rear bumper, immediately next to the muffler, has began to bulge ever so slightly compared to the left side.

Now, I think the increase in engine/exhaust temps is probably due to the car running not as rich as before and, that's what's causing the bumper issues. My question is; does anyone know if there ways/products to contain or manage the excessive heat? Like a vented rear bumper, perhaps?

Thanks.

[thewightstuff]

might seen strange but have you checked the positioning of the tailpipes themselves. if they arent adjusted properly they can get too close to the bumper with undesireable consequences, of which yours are at the extreme end of the scale