I've had my new HKS Hi Power exhaust on for a year now and when i rev it and let off when it goes back down to idle...right before, it's a high pitch sound from the back like something may be loose, but i've checked and everything is tight...any idea of what it may be???

 

Exhaust leak?

If it happens while you're stopped, try jacking the car up and localizing where the sound is coming from.

 

it does when i'm parked and reving it....if i find it...what's the fix?

 

ur gonna have to jack it up and get under and have someone else rev it up, theres no way to diagnose this over the internet with no sound

 

this is true....it's not loud though, more like a high pitch wisp like a turbo but except when it's coming down from rev....

 

gotta be a leak...check ur gaskets

 

sounds like it's going to be a leak...anything special i should use or just some regular high temp sealant

 

i guess it wouldnt hurt..idk, i did my high flow cats and my catback and used the oem gaskets with no leaks or problems..if they are in good shape shouldnt be a problem, just make sure they are on correct and that everything is torqued down good...get all the bolts in and lined up and start tightening from front to back...i put a bar on the end of the breaker bar after i tightened them all and gave it a little more to be safe..but not too much to break them

 

high flow cats huh....yeah, those are a bia#$%...i got some resonated test pipes and it's going to be hard getting the cats off...any recommendations?

 

putting them on isnt bad, its getting the stockers off thats a pain...get a deep 14 socket with a breaker bar, few different size extensions and a bar to put on the breaker bar to get more leverage when needed...all the bolts can be reached and removed from under the car, i tried from the top on a few its much easier from under the car..its a pain but not bad, ive had to remove them twice and it now takes me about 15mns. to remove both.. u just gotta find the right angles..driver side u gotta work around the steering stem..pass. side isnt bad

 

think its a 16 wrench to put on the other side of the bolt to hold it when tightening and loosening..also the bar that goes across for the brakcket doesnt need to be removed just loosened a little to move around...

 

also might wanna spray the bolts with something prior to starting to make it easier..try to be careful and not break them or it will be more of a pain..make sure ur straight on everything so it doesnt come off at an angle and mess threads up and also same for taking the o2's out, they come out crooked sometimes and messing the threads up on them is pretty easy and expensive for another one..

 

thanx for the help! sounds like extensions and breaker bars are going to be my new pals...prec the feedback tylerx!

 

no prob. mang