As the title, does it matter of horsepower?

 

Spark plugs do wear out. So, depending on the condition of the old plugs when replaced, new plugs may restore some horsepower.

 

im picking up a new set today so i could take logs and and put them into JOT's VDR Dyno Simulater for a before and after for replacing them and ill post up on here if there is any significant difference

 

Yes, especially if you are getting tuned, when you get tuned you should always throw in a new set of plugs.

 

+1...I think I'm about to throw my 5th set of plugs in when I get my new Turbo on and before my tune...I'm right at 54k miles...sucks IX plugs are so much more expensive compared to the VIIIs...

 

Yup almost $100 every time lol

 

The most I pay now is $48 shipped...

 

www.sparkplugs.com I think I pay around 50$ shipped for a set of IKH24's.

ILFR7H are 12.06 a plug there as well for those that run the stock IX plug.

 

i went on the dyno 2 weeks ago with the original plugs that the car was shipped over with, i pulled them out today and not really sure if they need replacing or not. i seen pics of some that look similar and people on here said they were shot. picking up some from napa in just a few minutes

 

Just make sure they are gapped properly and the proper heat range. You probably wont notice an increase in power as much as better drivability, easier startup, and a smoother running engine. looking forward to the results though!

 

This is definitely not necessary.

 

Your spark plug heat range with you amount of boost matters more.

One step colder with slight mods and two steps withbigger turbo and higher boost. More for detonation.

 

like others said, changing your spark plugs helps u gain the power that u have lost due to old plugs and also tuning.