Holley Systemax vs. RPM2 on a 331

riceslayer302 · Jun 24, 2008

ok, basicly just wondering what everyone's preference is here. It will be going on a n/a 331 with comp 280hr, AFR185s, 10:1, stock block.

vikingpower · Jun 24, 2008

I use a Victor EFI on mine, works really good

331fastcoupe · Jun 25, 2008

I'm running the systemax, there's an artical some where comparing the two . One thing I know is the intake ports are a near100% match to the afr's. I do recall they where both very good as far as power and torque with in 1-2 h.p . I would use a edlbrock on a 347 and a systemax on a fast reving and higher reving 331 . MY 331 likes 6500 rpm will dyno in a few weeks.

5spd GT · Jun 25, 2008

My vote goes for the Holley.

86bluecobra · Jun 25, 2008

I have read many good thuings about the holley. That being said I have never had one so my vote is for it but based on book bench racing.

riceslayer302 · Jun 25, 2008

the only reason for my question was i saw in the latest MM&FF they put an RPM II on their 93 cobra project. The thing that sparked my interest is they offer it in black, im trying to go all black in my bay, i dont think holley offers this.

FoxEffect89LX · Jun 25, 2008

RiceSlayer - I read the MM&FF article your talking about and if i remembering correctly they were replacing a Trick Flow Track Heat or Street Heat intake with Edelbrocks RPMII's. Obviously they gained more power, RPMII's have much shorter runners to begin with. As far as he Systemax goes, as other guys have said, its pretty much near a dead match as far as flow potentional andhorsepower is concerned. If your trying to keep your engine bay black, which is what i'm doing, I would go with maybe the Trick Flow R intake (not the box R) or the Edelbrock RPMII's in the black powdercoat. Good luck and have fun. Sounds like you have a good N/A combo going there.

Venom351R · Jun 25, 2008

Trick Flow R

bentley429 · Jun 25, 2008

Iam sticking with my vote for holley. Told you just paint the thing with some 500 degree spray can and it will look fine.

-styx- · Jul 26, 2010

so im curious....whats better than? the trickflow intake or the holley systemmax? im aiming for my hp n what not. thnx

Cobra912 · Jul 26, 2010

I ran a RPM II on my 331 when it was still N/A. Seemed to haul pretty good, even off the line. But I think my choice would be the Holley

-styx- · Jul 26, 2010

thats what i have no i had the holley i havent installed it yet just tinkering with the motor it self still but this guy keeps bugging the crap out of me to buy his trick flow intake that its better lol i didnt know thanks

fiveohwblow · Jul 26, 2010

Kinda funny this thread was resurrected as its OP is now back again... lol

Either way on topic have the Eddy, Holley and TF been tested in a shootout? Is/are there any graphs and or dynos?

cjrpony · Jul 26, 2010

fiveohwblow said:
Kinda funny this thread was resurrected as its OP is now back again... lol

Either way on topic have the Eddy, Holley and TF been tested in a shootout? Is/are there any graphs and or dynos?

Mustang Street/Strip Intake Test - Dyno Test Results - 5.0 Mustang & Super Fords Magazine

The Eddy made a few more HP and the Holley a few more torque. I personally run the RPM II but I don't think you would go wrong with either.

fiveohwblow · Jul 26, 2010

Am I reading that correctly though, the TF was the cheapest and produces the most power and torque?

Edit: "In fact, the Performer RPM II was this test's top dog-the only intake to sneak past the 450hp barrier. It posted the highest peak power, both in rpm and horsepower, and it hangs on to its power-making potential longer than the other intakes. Some of these trends are not huge, but they are pronounced enough to label the RPM II as the most horsepower-friendly intake here."

TF was second then with 447 and RPM II with 450.2 I would say If it were me I would go Trickflow to save $150, or spend the $450 on the TF and pay someone $150 to port match it and come out ahead of the RPM II with the same investment.

-styx- · Jul 26, 2010

yah but see i have the system max already. figured it was up there hanging with tf tho lol. i got a guy offering to sell me his new tf for 450 :/

NIKwoaC · Jul 26, 2010

fiveohwblow said:
Am I reading that correctly though, the TF was the cheapest and produces the most power and torque?

Edit: "In fact, the Performer RPM II was this test's top dog-the only intake to sneak past the 450hp barrier. It posted the highest peak power, both in rpm and horsepower, and it hangs on to its power-making potential longer than the other intakes. Some of these trends are not huge, but they are pronounced enough to label the RPM II as the most horsepower-friendly intake here."

TF was second then with 447 and RPM II with 450.2 I would say If it were me I would go Trickflow to save $150, or spend the $450 on the TF and pay someone $150 to port match it and come out ahead of the RPM II with the same investment.

I remember that magazine article, and there are a few things to note about the results. First notice they accidentally flipped the torque/HP columns. It's mathematically impossible to make your peak torque at a higher RPM than your peak horsepower.

Second, notice that they cut the test off at a measly 6000 rpm. It looks like the reason they did that was because all of the intakes were out of breath by then... Except the Eddie. The Eddie posted 450hp AT THE CUTOFF. It would have been interesting to see them pull the engine to maybe 6500 and see if the Eddie would have climbed any higher. It's hard to say, but fun to speculate.

fiveohwblow · Jul 26, 2010

NikwoaC said:
I remember that magazine article, and there are a few things to note about the results. First notice they accidentally flipped the torque/HP columns. It's mathematically impossible to make your peak torque at a higher RPM than your peak horsepower.

Second, notice that they cut the test off at a measly 6000 rpm. It looks like the reason they did that was because all of the intakes were out of breath by then... Except the Eddie. The Eddie posted 450hp AT THE CUTOFF. It would have been interesting to see them pull the engine to maybe 6500 and see if the Eddie would have climbed any higher. It's hard to say, but fun to speculate.

VERY very valid argument. I wonder what $150 worth of porting would do with the TF though. I realize its all speculation as you said, but it would be fun to see with the same investment which would be your best intake. Anyone want to fork these over I will use my beast as the test mule Already have a Cobra with a mildly ported lower intake

Blandnuts · Jul 26, 2010

Perhaps if you were close, I would be willing to test. But, you better be pulling past 6500rpms.

-styx- · Jul 26, 2010

ill prolly just buy the tf and run them both on the dyno and just see which one i like better i guess... i just cant make up my mind ugh!

Holley Systemax vs. RPM2 on a 331

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