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Discussion Starter · #1 ·
Hey guys. Just got my new HKS M45XL sparkplugs in anticipation of my tune coming in. I still have a couple weeks because I purchased a spare ECU. My question is; would there be any downsides of installing the spark plugs right now without the tune? I feel silly asking it but I see people replacing their OE sparkplugs sigh the M40XL with no tune. Couldn't find anyone talking about using the M45XL without a tune. I could just wait for the ECU to come in but I'm antsy haha.
 
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