15 to 20HP from boring your intake manifold.

[d_m_kolb]

Extrude Hone can bore and polish your intake manifold for around $400. As a claim to their abilities ... Ford sent the intake system from the SVT Contour to them and got 25HP over stock.You can also have your trottle body bored to match. 15 to 20 HP for $400 is a great price for that kind of gain.http://www.extrudehone.comIf you have furtherquestions for Rick please contact him at 1-800-613-1065

[wrench79]

when you say "bore and polish" does that mean "port and polish", i've never seen anybody bore they're intake manifold. Just wondering.

[NovaResource]

Yes, extrude hone is really a porting and polishing, not boring. Boring is more of a drilling process that uses a metal cutter to remove metal from the walls. The extrude hone process is forcing a semi-liquid substance that is highly abrasive through the intake. The abrasive material removes metal on the walls but it also polishes the surface. However, you must remove the intake manifold to do this and it's not reall a stand-alone modification. It shows best results with other mods such as a CAI, larger throttle-body and usually a bigger cam and/or cylinder head work (porting the head and installing larger valves). A free flowing exhaust also helps.I doubt there is 15-20 hp from JUST extrude honing the intake. Think of the engine as breathing through 4 straws taped together: the air box is one straw, the intake another, the cylinder head the third and the exhaust system the 4th. - let's say straw #1 (the air box) is 5mm in diameter - straw #2 (the intake) is 8mm in diameter - straw #3 (the cylinder head) is 9mm in diameter - and straw #4 (the exhaust) is 8mm in diameterYou main restriction is #1 at 5mm so just making straw #2 larger to 10mm (extrude honing the intake) isn't going to help you.Lets say to make straw #1 9mm (adding a CAI) now you have eliminated most of your restriction. Making straw #2 10mm (extrude honing the intake) helps slightly but not much because the exhaust is still too small.Bottom line: just throwing parts at a car doesn't work. You have to match things. Extrude honing the intake does create power but it has to be combined with an entire package of modifications designed to complement each other.

[d_m_kolb]

This is a bore job not a port and polish. Your boreing your throttle body and the intake manifold out to create larger passages for the air. A port and Polish would be polishing and reshaping the head around the intake ports. it would also involve polishing the valves themselves, and regrinding new angled seats onto the valve and valve seats.Yes your very rightabout the order you do things. I would never do this mod unless you had a CAI all ready or will have one when you get the manifold back. Also between the CAI and the intake manifold sits the throttle body. It to will have to be bored to match the size increase of the new intake manifold. As for the 15 to 20 HP, I'd call Extrude hone or look at there website. It's amazing what they can do with a stock intake manifold. All the rough areas inside the intake manifold are gone. Any sharp conners are also gone. Everything is very smooth with nothing to make resistance for the air flow anymore. The really nice thing about this process is that they can get into all the runners of the IM which most local machine shops can't.So if you do this have a CAI. Get your TB done at the sametime your having your IM done.Everyone grips that the Vibe doesn't have much in the way of torque down low. This is one of the best ways to help that. Your throttle response will be great, and you will really be able to feel the low end torque difference. Ask any one that has had a real CAI installed. Just that alone will help low end torque. Doing the rest of the intake will really help.

[korax123]

Yea i am going to get a CAI, i was gonna bore out the TB, and also have the Intake manifold matched, along with port and polishing the header, and mayby do some head work later on down the road. I mean i don't even got a vibe yet i just want to ask some stuff before i buy one. I think by the end of the month I may purchase one. A black GT , or Neptune, all one color. Thanks for the help

[d_m_kolb]

You can port and polish your head but it's very very expensive and the most you would see from this on a engine this size is 5 to 7 HP. A good machine shop will charge close to $500 to $700 for this kind of work. Also you'll want a 3 angle valve job done so add on some more money for the head.You'll want your head and intake manifold gasket matched also.A phenolic spacer is also a very good idea. For anyone that doesn't know what a phenolic spacer is or what it does, it is used in place of the stock intake manifold gasket and blocks heat from transfering from the head to the intake manifold. This of course keeps intake manifold temps down increasing engine output because of the cooler income air. This works great with a CAI.I'm looking for a manufacturer that makes these spacers for the 1ZZ and 2ZZ. I'll post back with that info. When the Intake manifold is getting done a machine shop will have to bore your TB for you, and match the IM to your TB. This isn't something you can do yourself since after your done boring it you'll have to install a larger butterfly to take up the larger bore of the TB now. Also doing the work yourself it's very easy to make your TB opening egg shaped which you might as well through it away if that happens.As for porting and polishing your header. Which is for the exhaust this is pointless and would be a waste of money. The only time you might BORE a exhaust is if you wanted to do this to your exhaust manifold increasing it's maximum flow. This will help some but in my opinion is to expensive and wont yeild much in the way of HP increase. Realize that the 2ZZ has one of the best maifolds on it all ready. Owners of the Matrix XRS who have changed the exhaust mainfold on the 2ZZ to a header have switched back because they lose all there low end torque and the lift at 6,000 RPM didn't hit as hard.The 1ZZ is also very well designed. I don't think that I would replace it. It will really hurt your low end torque and you want as much torque as possable to help you get of the line quickly. You could bore the 1ZZ exhaust manifold and it should help HP some but like I said before, it will be alot of money and not yeild much.

[Chris]

Remember the real issue is cylander filling... not necessarily flow... which necessitates high charge speed.A port and polish will always help as turbulance in the 'delivery system' is always bad.Boring the intake may help but when you get to boring the ports to provide a better mass flow into the cylander, you'll risk loosing HP as the slow, high volume flow may stop and even reverse when the piston starts coming up after bdc when the intake valve is still open. I'm not sure this is the case with the boring process as I don't completely understand what this is all about but, the key to horsepower is ensuring your cylander keeps filling until the intake valve closes.

[pissedoffgokart]

I tried boring my intake manifold once but it didn't yield any of these proclaimed results. Maybe I should try something other than Yanni next time. Perhaps some Enya or Kenny G?

[d_m_kolb]

This really isn't a mod that you can do at home well. You can't reach down the different ports of the intake manifold successfully. Also trying this at home with out the proper tools can result is worse performance than before. I have gasket matched my intake manifold before but for boring it I'll leave that up to the pros.