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With the inline 4 , the exhaust note wouldn't be the highest of best sounding, so you could test out exhaust pipes and just try to gauge it from there.

As for cutting cats it may be illegal depending on your state and etc, and you may be deemed to do a road side etest. But if it was a cat delete on a v6 the sounds would be a nice deep tone :)
 

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Atleast with a custom exhuast your able to decide what parts you want it and how many inches you want the tube diameter to be. Which helps in the quality of the exhuast note, but I'd say its better to go on with bolt ons as well but I don't think there are many after market parts.
 
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