Hello everyone,

I am new in this forum, and I would like to ask if anyone has ever installed the HKS downpipe with the stock exhaust on the WRX?

Second,
If yes, please describe the sound level and the process to joint the exhaust and the downpipe together?

I was told that the HKS downpipe will not work with the stock exhaust because of the rubber donut gasket that the stock exhaust use.

Thank you very much for any suggestion.

 

i have done that not much louder it sealed fine if you use the flat gasket that came with the hks use the bolts that came with it
or to seal perfect so it midas and get en 3194 its a bouble dougnut gasket if you use that use the stock spring bolts

 

So I can just use the stock rubber doughnut gasket with the spring bolts?

 

some people has done this, but I used my flat gasket when I had that set-up. It had no leaks. Sounded a little louder than stock.

 

Thank you for the advise. I will try it out and see.

 

I tried it with the HKS gasket and bolts, but I hear this whistling sound at a certain rpm. It looks sealed, but I hear weird whistling noise and rattle. Any suggestion?

 

id say put the car on jackstands and feel around the pipe and if it is leaking go to midas and buy gasket model EN1493 when i went they gave it to me for free its a 3" double sided doughnut gasket then just use you stock spring bolts and you should be good
here is alink wth a pic
https://www.i-club.com/forums/showth...ghlight=gasket

 

THanks for the advise, I will try to look for Midas and get the 3" donut gasket.

 

The reviews section might help answer some of your questions.