sheet metal intake manifold or extrude hone a factory?

here is the quote from there site.....

"Now, check this out. The number in red shows that 8.37 more CFM is now flowing through the intake/head which equates to a 2.8% gain in flow over stock simply by having the intake manifold extrude honed. Furthermore, through past experience of dyno testing similar gains in percentages, this equates to a 15-20 horse gain. Indeed, Extrude Hones's claims are on par. Heck, just for yucks and grins, we've even bolted up a competitor's sheet metal intake and it didn't even hold a candle to these numbers. Surprised? Honestly, we were as well. Don't even ask whose...we'll be too busy asking for a slice of Canadian bacon at the local pizzaria.

Thought that extrude honed intakes were a bunch of bologna and waste of money? You be the judge."

This is there address...www.ffwdconnection.com/flow.shtml

Of course a stock manifold will outperform a SMIM in midrange power and up to 6000rpms. After 6000rpms, with proper cams, the SMIM then begins to shine. Where the stock manifold will just not cut it. The gains from a SMIM are all up top, not midrange power.

Do you lose any low to midrange power when switching over to a sheet metal manifold? I would like to get my hands on a jm fabrication, but i cant seem to find anything about it other than nukefussions review, but that didn't get into any type of performance reviews.

From what i've read JM fabrications SMIM is a pretty good product. I've read several reviews and they've all been positive. Some worries about it are that it is square in design. Air flows better through rounder designs, but every round design I've found has been expensive. If you're looking for good midrange power and are shifting before 7000-7500 rpm. The Extrude honed seems the way to go. But it is expensive and when you finally go for that big setup (if you're going to) your going to want a SMIM which gets you that top end power when you're shifting at over 8grand. Find a used extrude honed mani like I did for half price. When it comes time to upgrade I can probably get almost what I paid for out of it.

Different intake manifolds, and cams for that matter, mostly shift the power around to higher or lower in the power band.

Some may have a fatter power band because of a better design, or cams with a better profile, but they all have their compromises.

Extrude hone will take the power up a bit in the RPM range, which is probably good for most people. The guys with the big turbos in the 50lb+ range need a SMIM to be able use a high enough rpm to take advantage of the power.

-Dallas J

On his site he reports that on a fp green with stock head and cams he droped his ET's from an 11.9 to an 11.5 that's a nice few tenths. What is the fp green rated to flow 49-52lbs im not exactly sure.

Broken2g said:

On his site he reports that on a fp green with stock head and cams he droped his ET's from an 11.9 to an 11.5 that's a nice few tenths. What is the fp green rated to flow 49-52lbs im not exactly sure.

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He picked up about 2mph with the intake - the rest was improvement in driving. You can't expect much more than that on a 50 trim with stock cams. Many fast guys are using his intake now, and Bean at Turbotrix gained alot of power switching from the Magnus to the JMFab one.

well thats the thing Im not running stock cams I have hks 264/272 but i may be swapping out to a 272 intake, Iwas just curious to see if it would be worth the $450 dollars.

Spyder1gdsm said:

Of course a stock manifold will outperform a SMIM in midrange power and up to 6000rpms. After 6000rpms, with proper cams, the SMIM then begins to shine. Where the stock manifold will just not cut it. The gains from a SMIM are all up top, not midrange power.

Click to expand...

Broken2g said:

Do you lose any low to midrange power when switching over to a sheet metal manifold? I would like to get my hands on a jm fabrication, but i cant seem to find anything about it other than nukefussions review, but that didn't get into any type of performance reviews.

Click to expand...

I had an Extreme/Hogan SMIM and the turbo spooled slightly quicker than with the 1G factory manifold. I never really noticed any drop off of midrange power either.
Now running a JM Fab with a 3" TB I don't think it greatly affects the spool time and boost comes on stronger @ 4500 than with the Extreme or factory pieces. I have not experimented with a turbo flowing less than 60 lbs/min since moving up to the 3" TB. I used the Extreme with a 14b, B16G, H3 and a 60-1. I used a 1G intake on all of the above including a 50 trim. Both manifolds were ran with factory diameter 1G throttle bodies.