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Doug Thorley shorties have to be welded to the downpipe just above the cats, and the original downpipe must be cut according to their instructions. They do not bolt directly. This makes installation something of a pain, since most people cannot do it themselves; however, this also means there is very little chance that they will leak.
EDIT: If you're referring to the connection to the engine block exhaust manifold, you reuse the stock header bolts; so, there's just as much chance of a leak there as with any other headers.
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Performance Mods: Injen Powerflow CAI, Doug Thorley Cat-Back Exhaust, Doug Thorley Shorty Headers, Trifecta Tune, TSW Nurburgring Wheels 20x9, 3.45 Ratio LSD Swap, VMax Black Ice-Olator
Appearance Mods: RiderGraphix LS7 Front Fascia Blackout Vinyl, Gill Insert Vinyl, Rear Deck Lid Vinyl (Gloss Black), Gary's Customs Painted Bowties
Coming Soon: BMR Trailing Arms
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