Driving to Austin next week if time allows for a custom dyno tune for my coupe. Cleaning my Stillen filter this weekend. Car is at 48K, should I swap out my plugs to get the best tune possible? Would it help or not at all? Please advise if you've done this at this mileage. Thanks.

 

Probably isn't necessary but wouldn't hurt... its doubtful you would see measurable difference unless you index the plugs (and even then it probably wouldn't be much)...

I changed my plugs at 20+K. But that was because I wanted iridiums... the OEM plugs are supposedly good for 100K but I wouldn't wait that long.

 

My stock set of plugs (Platinums) were changed at 75k, they looked like they needed it.

The next set (also Platinums) was swapped after 50k, they looked okay, but were due for a change.

I think my new interval will be 50k for plugs. I'm running Iridiums now.

 

Cool, I'll probably change them at 70k, afterwards at 50k intervals. Thanks.