Off road H-pipe... fumes???

Question to all who've installed an offroad pipe... I installed an offroad H-pipe & duals on my wife V-6, Now when parked at an idle the fumes are almost unbearable, with the windows up or down. There's no leaks and the out-let is at the bumper. Not sure if it's because of no cats???
Just wondering if any others have this problem before I bother installing one on my GT???

It's not a problem if that's what you mean. You may need to consider a tune to advance the timing a bit & maybe lean it up a bit to take advantage of the O/R pipe. Do you have a wideband or something to measure your a/f?

yeah Glenn Dan and I are both running rich as hell with the O/R pipe... It's normal with running a stock tune

yea you need a tune, i tuned mine when i got my hpipe and its not running rich anymore

The V6's must really be under tuned or over emissioned because neither of our GT's was as bad as yours sounds. GT's pick up "maybe" 10-15rw with the O/R H's; what do the V6's usually pick up from an H pipe & tune adjustment?

I have a tuner for my GT so maybe it wouldn't be so bad. Not realy wanting to go all that far with the v6 the origanal exhaust had some leaks so I thought an upgrade would be good since I was changing it anyway, I put on a mac H-pipe,. Never realy liked the way it turned out. And thinking now about switching back to cats. if I can find a useable stock system.

Are you sure you don't have a leak further up. like on where the Manifold meets the down pipe or even the Exhaust manifold to the block gasket?