whistling sound coming from y-pipe '94 ATX

[tailerdeal]

i recently had a custom exhaust made for my '94 ATX. it consists of a new flex pipe, an 18" magnaflow resonator, and 2 magnaflow xlturbo mufflers, 2.5" pipe for everything from the end of the y-pipe back. the new exhaust sounds very good, has a VERY deep tone and very little rasp. the problem i have now is a whistling sound coming from around the y-pipe whenever i go past half throttle. cant exactly figure out where it is coming from. im thinking that because its still the STOCK y-pipe and cats that one of my cats is probably packed up and not used to having the increased flow from the rest of the exhaust behind it. i would really like to know if anyone has had this problem before. and if so what was the issue and how was it solved. also i want to replace my cats, so im also looking for advice on how to go about it, ie.(hi flow cats, stock replacement cats, no cats, new y-pipe, etc...). thank you for your help, take it easy and have a good one.

 

[SeanMc]

Go to your exhaust guy and have him re-weld it.

 

[tailerdeal]

i already have and all the welds were good. i went under and checked myself.

 

[lowc]

definitly sounds like exhaust leak

 

[LOUDSHO92]

replace the gasket?

Maybe a new y-pipe if you want to replace it.

 

[SeanMc]

Then it could be the gasket like Matt said. I'd have them recheck.

 

[NotSoSlowSHO]

Bet he used a cheap flex pipe, one with a corrigated core.

They whistle like crazy

 

[tailerdeal]

you know i never thought about the flex pipe. im getting it up in the air tomorrow again to try and solve this. and id love to get a good y-pipe, i was never able to get one from SHOSource cause of the group buy. and i think they have since stopped making them. what should i go with now??

 

[LOUDSHO92]

We do have 2 aftermarket y-pipes.

 

[tailerdeal]

We do have 2 aftermarket y-pipes.

which would you recommend, the walker or the catco??