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Hello guys ..
I wanted to ask! Which one of these gives the best performance?
( My challenger 15 rt plus )
Your '15 R/T has iridium plugs as OEM and they're good for 100k intervals, unless their performance degrades and its time to change them sooner.

[5.7s have used iridium plugs since the '14 models]
 

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Your '15 R/T has iridium plugs as OEM and they're good for 100k intervals, unless their performance degrades and its time to change them sooner. [5.7s have used iridium plugs since the '14 models]
That's good advice, especially when you consider that our Hemi engines use 16 spark plugs.
 

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Discussion Starter #7
Hal H

I wanted to increase the acceleration By this + MSD 82558 blaster coil-on-plug !
 

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Wasting your money.The best aftermarket coils may give you a 10-15hp gain.Not enough that you are going to notice or justify the cost.
 

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Wasting your money.The best aftermarket coils may give you a 10-15hp gain.Not enough that you are going to notice or justify the cost.
That $430 for a set of coils would simply lighten the bank account. Nothing to gain by replacing brand new coil packs.
 

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Discussion Starter #12
I will retract their purchase!
What do you advise me to do other than these?
 

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I will retract their purchase!
What do you advise me to do other than these?
how about the basics:

1. catch can
2. CAI
3. can tune
4. update your car information on your forum profile
 

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$14 and $15 a plug...I don't even spend that on nitrous plugs.
 

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Let say just for fun that you see a 8 hp gain by installing fancy plugs or coil packs on a mostly stock vehicle (bolt-ons).
A 8-10 hp gain on a 4000+ pound car is not going to be discernible to the butt-dyno.
I have to laugh every time I see someone post about "feeling" a different after installing a CAI, catback, etc.
 

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Let say just for fun that you see a 8 hp gain by installing fancy plugs or coil packs on a mostly stock vehicle (bolt-ons).
A 8-10 hp gain on a 4000+ pound car is not going to be discernible to the butt-dyno.
I have to laugh every time I see someone post about "feeling" a different after installing a CAI, catback, etc.
Probably more from the sound change intake and exhaust makes, makes it feel faster. At 6000ft, I know my manual R/T is slow. It's not exactly a stoplight terror at sea level. I've got a Flowmaster American Thunder cat-back. But, with the exhaust screaming at 5k RPM it's enough to fool my senses into thinking it's a beast.
 
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