long tube headers or performer manifold?

homerojr · Jul 13, 2005

I´m about to install my AFR165, and together with my existing combo, what would bring more benefits in terms of hp, torque and SOTP, a LT exhaust or a performer intake (considering I got a cobra manifold slightly polished and ported, a XE270HR cam and MAC unequal p-headers, see signature for other mods). I can´t afford the two mods right now.
Any suggestion is welcomed!

94GTLaserRC · Jul 13, 2005

homerojr said:
I´m about to install my AFR165, and together with my existing combo, what would bring more benefits in terms of hp, torque and SOTP, a LT exhaust or a performer intake (considering I got a cobra manifold slightly polished and ported, a XE270HR cam and MAC unequal p-headers, see signature for other mods). I can´t afford the two mods right now.
Any suggestion is welcomed!

With your setup there is NO advantage of a Performer intake over a ported Cobra.

My Vote Is "Long Tubes"
RC

Methodical · Jul 13, 2005

I'd say long tubes to, especially since you are replacing the heads and already would have removed the old headers. See, I try to be efficient. The Cobra intake is good for now. Plus if you do decide to replace the intake in the future it would be easier than replacing the headers. Just One Man's Opinion. Peace

Venom351R · Jul 13, 2005

Im saying to go w/ the Intake. If you put equal or shorty headers on your AFR's it will still be a good power increase. If you dont do the intake are you saying that the stock intake will be going back on? IMO aftermaket heads + Aftermarket Intake + shorty headers will give you more of a performance gain then Aftermaket heads + stock Intake and LT's

final5-0 · Jul 13, 2005

You do know that you need a different mid pipe for those lt's...right?

I assume your going for the 300 or better goal so .........................
your gonna want a better exhaust & intake anyway.

I'd do the lt's mid pipe and AFR's all at the same time as the lt's just fall into place when you got your motor in a heads off condition.

My best advice is to be patient and do the heads, lt's, midpipe, and cam all at the same time.

When you got the heads off it takes just a little more work to throw a cam in there.

Later
Grady

Scott_95GT · Jul 13, 2005

There will be no benifit bolting up a performer. GT-40/Cobra intakes have been proven to put down great numbers, especially when ported. The performer might shift your peak a bit, but it won't gain you anything.

If you don't need to pass smog (It would be a pita swapping in and out LT's to pass) I would go with 'em. Obviously you will need a new mid-pipe also.

FastFord · Jul 13, 2005

final5-0 said:
My best advice is to be patient and do the heads, lt's, midpipe, and cam all at the same time.

When you got the heads off it takes just a little more work to throw a cam in there.

Agreed!!

homerojr · Jul 13, 2005

Thanks for your opinions . I was afraid maybe the AFRs could provide much more than my Cobra intake could handle, becoming the "bottleneck" of the setup, so I decidedly would go the performer route at once (or even the performer rpm). The cam won´t be changed (it´s the XE270, and I´m satisfied with its profile, and considering lift, duration, lsa, rev capacity, I guess I can make good use of my new heads. I´m also aware of the shorty mid-pipe. Could I expect some noticeable torque increase at low end with the LTs? And at top end? Does the different designs between BBK and MAC (my primary choices) mean different performances?
Thanks again for sharing your knowledge.

94GTLaserRC · Jul 13, 2005

Striped5.0 said:
IMO aftermaket heads + Aftermarket Intake + shorty headers will give you more of a performance gain then Aftermaket heads + stock Intake and LT's

He has a ported Cobra intake!

final5-0 · Jul 13, 2005

homerojr said:
Thanks for your opinions . I was afraid maybe the AFRs could provide much more than my Cobra intake could handle, becoming the "bottleneck" of the setup, so I decidedly would go the performer route at once (or even the performer rpm). The cam won´t be changed (it´s the XE270, and I´m satisfied with its profile, and considering lift, duration, lsa, rev capacity, I guess I can make good use of my new heads. I´m also aware of the shorty mid-pipe. Could I expect some noticeable torque increase at low end with the LTs? And at top end? Does the different designs between BBK and MAC (my primary choices) mean different performances?
Thanks again for sharing your knowledge.

You can expect a better gain at low to mid range from the lt's over shortys. At the top end they are much closer to each other.

BBK or MAC will be about the same from a performance point of view.

If you go with the Hooker or one of the other lt's that have a true collector that does not neck down to the ball & socket style of collector like MAC & BBK, some folks say you can pick up some more power.

Later
Grady

95snoozer · Jul 13, 2005

yeah running hookers would be sweet if you could afford them.

macs do the trick

i would go long tubes

how much power do you make?
because i dont see you gaining very much power at all with the afr 165s over the ported gt40Ps with that cam. thats pretty much my combo and i dont have ported and polished P heads. I just have bowl blending and no egr bumps

another afr 165 car with the xe 270 made 304/327

a car with my setup with a cobra intake made 302/327 with the same cam and port matching the runners to a 1250

i know this is weird but i suggest you save all your money and just get your current setup straight

tune it, get long tubes and put the rest of the money into something else, Nitrous

find a used vortech

sure there is a weight difference with iron and aluminum... maybe get a k member

95snoozer · Jul 13, 2005

http://cgi.ebay.com/ebaymotors/ws/e...ategory=33741&item=7985765476&sspagename=WDVW

homerojr · Jul 13, 2005

Hehehe, thanks for your support, snoozer, I´ve seen the ad. By my 2 years of experience with my p heads, I can assure they´re a great bang for the buck. Nevertheless,everybody praises the AFRs, including independent testers and test mags and as Elvis said "50 million fans can´t be wrong"... I gotta check for myself.... Hookers are out of reach...and yes, MACs may do the trick.. I have my catbacks and headers for over three years and they´re ok, no rust, the tail pipes still beautifully chromed. My BBK h-pipe, needed a lot of work to fit, though

95snoozer · Jul 14, 2005

swappin heads for 10 hp...

well good luck

homerojr · Aug 8, 2005

Sorry to disagree, but I guess it´s a little bit more than 10hp... (at least the potential is there, all is in the combo and tuning)). After I did take a look at my brand new AFR´s, there´s simply no comparison, when you realize the engineering involved in there; the intake ports are huge all the way to the valves (and all are equal, thanks to 5 axis 100% CNC), and so the exhaust ports. The intake and exhaust ports has some "elevation" going to the valves sticks, so the flow is directed not to create turbulence. The curves to the valve seats are gentle and smooth to the touch. As a bonus, man they´re feather weight compared to irons!! Wait, there´s more! In case you want to work it (slight cleaning of inner surfaces and cc, due to the concentric lines originated by the CNC process, I bet some more hidden cfm flow will still show up (we are talking over 240 cfm intake at just 0.500 lift). I´ll try to post some good pics to illustrate what I´m talking about.
By the way, I´ll do some more port work on my lower Cobra intake, as well as gasket match and port match, and will follow the long tubes route.

long tube headers or performer manifold?

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