My 2008 silverado had the old manifold leakin tick for a few weeks now so i looked this am and discovered that both the left rear and right rear manifold bolts were broken, after i was finished swearing , jk, i was wondering if anyone else has found this, my 99, and 05 all done the same. and i know the routine but curious if it would be a good time to switch to a direct bolt on header as I do alot of towing, any suggestions, also this has got to be a chevy problem,,,,