spark plugs

[MrMajestic]

What spark plugs are going to show a noticable change in my 2002 RS? I was told to get Bosh Platinum +4. Are these the best?

Also, does Cobb have the best Cold Air Intake Kits?

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[tonytiger]

Dunno, which are the best plugs for RS or any other Subie, but nothing big is going to be expected in power with plugs change. Of course if your old ones are malfunctioning it is a different story.

However in mileage and at idling there might be noticeable gains. The car might idle more smoother and start up more easily. And in long term that might lenghten your motors life, I guess...

If you do a search about which being the best spark plugs, you'll find tons of arguing which plugs are the best ones. Bosch Platinium might be a good choice, referring to the old threads. They are pretty expensive, though.

If you wan't to try something different try this:http://www.directhits.com./ . Their product sounds good and they should last the a car's lifetime. At least they can do convincing advertisement



tony

[imprezadan]

I've been told to stick w/the factory NGK plugs. Working in a dealership I have seen how poorly cars run on anything but the OEM plugs(most of the time).

[rpone605]

I had the Champion's from the factory in my car. I replaced em with the cheap ngk v-power or whatever and the car ran better and stronger.

[Freeskier]

I just received my Denso Iridium plugs. Now I have to find the time to install them.

Stefan

[Kevin Thomas]

Originally posted by MrMajestic
What spark plugs are going to show a noticable change in my 2002 RS?

None! If you have good running spark plugs now (an exception would be Champions from previous posts), you will not find any noticable difference in 'performance'. Depending on what you mean by performance (drivability, idling, 1/4 mile times, etc), different plugs may perform slightly different in your car.

Originally posted by MrMajestic
I was told to get Bosh Platinum +4. Are these the best?

I tried them in my Outback Sport and didn't notice any difference in 'performance' than the stock NGK plugs. I'm not going to try Champions, not even to test. The NGK's work great and are cheap. Best bang for the buck.

I recently installed Denso Iridium's and Magnacore wires after 30k miles on the stock crapions. Made a noticeable difference in mileage as well as how smooth the motor runs, especially at idle. Starts easier too. Highly recommended mod to do. Total for parts $150.00 and about half an hour lolligaging around changing the plugs/wires.

[Bruiser]

I have been using the Bosch Platinum (not +4) with satisfactory results. I also have had the Cobb intake installed for several months and can honestly say it's great. Is it the best? Who can say, but I love the sound at when acclerating hard.

[dRu18]

all of those expensive plugs just help mileage, fuel economy, and better start up. thought w/upgrades i.e. intake, exhaust, you may find a smoother pickup through your RPMs. don't expect any spectacular gains. if you have an ultra high performing BEAST then you should change plugs, but for now you can stick w/some ok ones, you don't need bosch platinums w/magnecor wires and direct hits if you are running a stock car

[dRu18]

i hear the rallispec one is pretty good as well.

[ChosenWon]

I am useing the NGK's. I see a noticable difference.
1. way smoother idle
2. lost that slight misfire/hiccup at idle
3. rev's are a lot easier
4. I had a major surge going from about 3,700rpm's to 4,300rpms and the new plugs and wires seem to have smoothed that out considerably.

As far as I am concerned if it will not make a big difference, why pay extra. and that goes for both the bosch +4's and the outragous iradium plugs. For $6 for 4 NGK's and change them out every other oil change (12K total, running synthetic), I think is a much better option.

Some might say that the crapions are ok to run for a while, but after having new (inexpensive) plugs in, I wish I would have changed them out earlier. Especially considering the low cost.

[Blindeye_03]

I am around 9700miles mileage wise, and I cant believe that the champions lasted me THIS long. The stockers were black on the tips. The good thing about the ngk's is that my idling is alot smoother, and I dont think I run Quite as rich (you can see moisture out of my exhaust tip), its not as 'dry' as it used to be. Preformance? I dont think it changed anything, it juust make the car easier to be inside w/o the misfiring of the old plugs.

I agree with ChosenWon 100%.

[ChosenWon]

These are alternating Crapions and NGK's. They were only in the car for 12K miles. How good do you think they would look after their reccomended change interval? I am glad I did not wait any longer than I did. Be good to your car, spend the $6 and the half hour to hour and put these in.

Thanks Blindeye_03