The Stillen kit out of the box is designed to go with a stock exhaust....you can use and aftermarket 2.5 inch exhaust with TP's or HFC's(you brand of choice) but it would require a custom tune.....these kits are known to run better on a custom tune.
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2013 Nismo Z34 / FI TT #091 / IG: @lilzilla_z34
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