Don't think an exhaust leak will effect your boost.....unless the leak was between the turbo and the manifold.....

 

put a spacer between the 02 sensor and the exhaust pretty sure the anti foul spark plug spacer fits in there ive got a 90 like the other guy said but if you cant weld this whould be cheaper/easy

 

no my exhaust was leaking and i didnt have any drop in boost, most people in here with a HF cat that get a P0420 code should first check for leaks, your cat might be working properly, it just that the flanges where the cat and cat-back meet might not be totally compatible and need to be double gasketed or try to find a way to bend the flanges so they meet perfectly.

 

Still have had a chance to check for leaks.. P0420 again today I really hope my dp isn't leaking because I had it welded to the cat.. I'll have to damn near drop the entire exhaust to take it off

 

it s mostlikly leaking where the cat and cat-back meet. check there

 

Looks like where the dp meets the cat.. the ONLY place I had it welded because i screwed up my clamp and it was leaking worse.. I'll take pics of the weld.. after looking at it i'm not happy at all. I really thing I could do a better job but I don't have a welder powerful enough for exhaust work.

I'm taking pics now

 

Ok here are the pics.. It's hard to take decent pictures under the car but I did the best I could.. The weld looks like it has 2 holes 1 of which had some nice black crud almost dripping out

These pics were taking after I cleaned it up.. The weld doesnt look half bad for the top portion but the rest looks like a 5th grader did it.. Needless to say I'm going to take this back to get fixed asap.









and just for kicks a 100% non leaky BR bandclamp (where cat meets catback)

 

i c
well the only way to see if it leaking it to let the engine run and pass your hand where u think it s leaking, u will feel it with your hand, be carefull dont burn yourself

 

Yeah that's next

There is great evidence of 1 possibly 2 leaks in the welds

 

Yup mines leaking.. both holes.. I've only got a little cheap mig so I guess Ill have to take it somewhere to get fixed.. this is why I have no trust in local shops