Quick Ph1 172 Exhaust Question regarding length

[EngineerD]

I'm looking to buy a new backbox for my Ph1 172 - am I right in thinking that only the length for the centre section differs between models with or without a post-cat lambda sensor, and therefore the backboxes are identical between all Ph1 and Ph2 172s?

 

[105e]

You are correct about the mid section (post cat sensor or not) so would assume correct about rear section, I actually run a complete phase 2 system on my phase 1.

 

[dmallett]

Depends on which cat iirc, if you have a twin sensor cat it's about 2" longer than the single sensor cat.

But yes, it's only the centre that changes Due to the cat length

 

[EngineerD]

Excellent, I have the twin sensor Ph1 cat so Ph2 system it is.
Cheers