destroyerSS

iTrader: (2)

i have bosch +4's and i have been told lately that they suck whatcha think should i switch to ngk tr55's ??

jpz28

Well they worked for me... ...I like them and I like the fact that you don't have to replace them sooner than cooper I believe but its mostly up to you and the maintanance of your car........But I heard iridium ones are better so I'll try those.....just my 02 cents...

mcflyz28

I went from NGK TR-55's to the Bosch , reason I'm not changing plugs anymore, they work fine for me.

30thWS6

Bosch platinums suck. Trust me on this one. Do not use them!!! If you want the longevity of platinum use the NGK's or the Delco's.

TaTommyWS6

I has bosch +4s in my car for a few weeks. With my stock cam I saw a number of misfires at idle... I went with NGK TR-55s, no mroe misfires. It only takes an hour to swap plugs, NGKs are my choice...

Tommy

kickassT/A

iTrader: (3)

Stay away from anything bosch. i work for a dealer, and we constantly throw those things out for misfire complaints. definately go ngk over those pieces of crap any day.

Tom L. Busby

No misfire problems for me. I'm on my 3rd set of Bosch +4's and replace them after 25,000 miles. Regular plugs wear out sooner than that.

LT1 Guy

No problems from Bosch +4 from me. Had them since the odometer read less than 2000. Now at about 70000, they still run like new but I'm changing them for the iridium NGK's, just 'cause I can.

4thGENRETARD

I have DENSO iridium they are great. NGK's better if u have NOS or blower. I took mone off to read after 15 k and they were as new with excelent color.

TaTommyWS6

Did you actually ATAP it?

malibu350

STAY AWAY FROM THE BOSHCH PLATINUMS!!!!!!!! I've worked at an Advance Auto Parts now for over 2 years...and these suck...customers bring these in all of the time for being defective...I recommend the TR55's to everybody and so far no problems...TR6's if you have any type of power adders...take them out and return them...they have a 5 year warranty and the store should take them back...if not drop me a pm

30thWS6

I'm glad to see not everyone is brainwashed by Bosch's BS. If you talk to people who really know their stuff, like people working in the field everyday, they'll tell you these plugs suck. Don't listen to your ricer buddy down the street who'll buy anything that's bright and shiny.

Freak

THe +4's worked great for me when the motor was stock, no misfiring, yes I autotapped it.

since geting a cam though I have been getting some KR, think it may be from the plugs being too hot, heard of others having that same problem. went to TR6's the other day, havent had a chance to A tap yet though...

gus99ssm6

the +4's worked fine in my car, no misfires.

JCS30TH

iTrader: (1)

Ditto, I have them in mine (stock) and the car runs fine.

gforce477

iTrader: (1)

I had the bosch 1's and they suck, so I can imagine the 4's can be much better, the spark can only jump to one right? Mine misfired like crazy

ss rally red

iTrader: (8)

I can not tell you how many "do it yourselvers" use these plugs and bring their car to our shop with misfire codes/skipping problems. I love these plugs

Damian

iTrader: (89)

Those plugs suck nuts. I put them in my beater and they went to **** in 9500 miles.

CamTom12

iTrader: (1)

Harder metals (platinum, iridium) hold more heat, or at least dissipate it slower...

I don't know how much of a performance difference it would make, but I've been running the regular NGK's. If I have to change them more often, it just gives me a reason to check out the top half of my motor really well for about an hour or so (and then when I finish with #8, I can move on to the others )

Maybe that misfiring is pre-ignition cause of a hot plug?

TraajicLS1

I put in TR55s and my throttle response when down the drain .... sluggish & unresponsive..... put it in the Bosch +4s and it picked right up again & better than the factory AC Delco platinum plug ...

i dont see all the hype with the TR55

changing plugs 3 times in a weekend is not my idea of fun