Knock off parts are common in everything but from the stories it seems they are accused of rushing copycat items to market of questionable quality.
Thankfully there are forums like this with knowledgeable members that allow you to research aftermarket parts. I must have read every exhaust post on here before buying my fast intentions exhaust. Not the cheapest but the quality matches the price!
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2012 370Z GM 7AT/JWM LEDs / 3M clear bra / 35% tint / GTR start button / FI CBE SS 18" RES / Momo shift knob / K & N Typhoon / Z1 hood struts / H&R 20mm f/r / illuminated kickplates
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