Exhaust pipe over Rear Axle, a bad thing?

hey guys...just needed some feed back because ive gotten mixed answers from people who "know about cars".

i just got a flowmaster installed on my 06 taco....i put a turndown pipe on it, and when the dude who welded it on, put the pipe directly above my rear axle so its blowing down on it...someone at work who knows a LITTLE something about cars told me that it can mess up my axle...another friend who races baja and has built a few cars said taht it should be ok and that since im moving while the exhaust is blowing on it it shouldnt be a big deal.. after driving my truck home from work today(about 25 min) i felt my axle on the side with the exhaust and it was warm/hot but not to hot to touch and the other side that doesnt have the exhaust blowing on it wasnt warm at all....any clue if it will affect my truck or will mess anything up? please let me know.its an easy fix but i dont want to mess with it if i dont have to.. thanks!!

 

do you think it will affect anyting? do i need to keep my axle cool? the guy at work said something about it will cause oil in the axle to boil or something like that

 

I had mine turned down just before the rear axle. No problems so far! But I asked the muffler guy to turn it down before where its not blowing directly above the axle.