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Discussion Starter · #1 ·
I just purchased the HKS Ti for my MY05 Sti.

I was under the impression the exhaust was a 3' cat-back.

I measured the internal size of the piping and it was 2.75.

Then I had a look inside the muffler and trimmed a card board piece until it fit nicely and it measured less than 2.5inches.

We also had a look into my friends HKS Ti for the EVO 8-9 and it was the same.

Is this normal?
 

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The Hoff Fan Club, member #001
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im assuming thats normal, i have never measures the id size of the piping though. you bring up a good point, since i knew the exhaust was 3'' but i never really thought if that was id size or external size.
 
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