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Ive asked several people on this forum about which size catback to get, my good friend who is a great mechanic told me to get a 3"dp and a 2.5" catback for more tq and less boost lag.

I was going to get a custom made catback and currently my other mods are injen intake, samco pipe and elevate tcv. will a catback benefit much without having a tune?

I was debating on getting the catback or a fmic
 

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a catback does only a few hp gain. Its more for the sound and looks. The 3"DP does the big hp gain.
I would go for a bigger FMIC! thats a very big improvement, and it looks great to:

 

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if you for for power, the DP and FMIC with a tune gives the best result. i did all my hardware changes before tune.
Result without tuning was 224pk and 352Nm, thats not much gain, but after custom tune 294pk and 501Nm
 
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