Hks race car install

[Sleepergm]

Hi all,

 

so don’t get to get under my gtr much in Hong Kong. Used to get under my cars all the time in the states. 
 

anyway my garage took out my hks silent hi low cat and was wondering does it just bolt back into the system with new gaskets? I’m guessing yes. 
 

Photo attached. Thanks 

[GTSBoy]

So that will really depend on what else was changed when it came out. If it is the same front pipe and the same cat back, then yes.

Plus you might have to work out what they did with the themperature sensor.

[joshuaho96]

5 hours ago, Sleepergm said:

Hi all,

 

so don’t get to get under my gtr much in Hong Kong. Used to get under my cars all the time in the states. 
 

anyway my garage took out my hks silent hi low cat and was wondering does it just bolt back into the system with new gaskets? I’m guessing yes. 
 

Photo attached. Thanks 

Yes, just throw some gaskets at it and put it back in. As long as everything is actually designed to bolt up together it will all go back together. My CA compliant exhaust for example can only fit with the specific catback I gave them.

[Sleepergm]

Thanks everyone … will give it a go. Hope the added back pressure doesn’t screw up my weak rich idle issue I have… would be great if it helped it😃

[joshuaho96]

On 10/05/2025 at 5:06 PM, Sleepergm said:

Thanks everyone … will give it a go. Hope the added back pressure doesn’t screw up my weak rich idle issue I have… would be great if it helped it😃

Running rich in conditions where it shouldn't probably won't do great things for catalytic converter lifespan. I would fix that sooner than later.

[Sleepergm]

14 minutes ago, joshuaho96 said:

Running rich in conditions where it shouldn't probably won't do great things for catalytic converter lifespan. I would fix that sooner than later.

Yeah very valid point. I am waiting for one of the other tuners to come back from vacation so he can help me a bit when the cat is installed again. In the meantime I am going to finish up my polishing and ceramic coating that I have started myself. 

 

N45 Dr Beasley product is highly recommended for a paint primer / polisher. Using this EXO Gtechniq also for the ceramic but next time might use the light serum before hand also. Looks great. 

[Sleepergm]

Just an update  ... Put the cat back on no issues with the car running wise ... maybe alittle longer to spoil up the turbo. Still running rich but waiting for my tuner to come back into town to retify the situation. WOT runs fine with the cat.