Getting FI-ready

[HighLife]

Many of us think that it's going to be a while before we upgrade to FI. Whether its due to the kits available, prices or the fun of adding power adders one at a time!

However, for those who are ultimately going the FI route and hoping to achieve 400+ RWHP, we'd like to upgrade things that would need upgrading anyway when we install the FI kit later.

So, instead of doing a 2.5" exhaust, we prefer to go with a 3" system as the latter goes better with the FI. Highest flow becomes the name of the game also for the CAI.

So if I want to be be FI-ready, what exhaust system should I be installing? What intake system? Anything else?

Hope to hear from you all

[JP]

I wouldn't bother fitting anything until you actually add the turbo or supercharger.

A 3" exhaust sounds aweful on a NA setup and a CAI designed to replace the stock intake may not fit the turbo or supercharger setup.

[HighLife]

Yes. This is one option for patient people.

Many of us like to add things gradually making the car a new one every time something is added.

Also, it is easier on the wallet.

[gmookher]

any quality mandrel 2.5" is plenty of tubing and able to retain mid range torque better than going to 3", so unless youre building a pure race car that will spend a short life living at 10psi, you wont benefit 3" piping, its not a turbo 6, its a small displacement 4...

While you may prove one can make a few more HP on a dyno, tuning for driveability in real world gets more a compromise

the header is still what it is, and removing the 1st cat will both add sound and power if thats what you seek, before spending on 3" cat or headerback, buy a header, if you want more kick in the pants

I have gone with a Perrin headerback and am waiting on Borla EL I managed to sneak a pre order in for..and my car is at Vortech being tested and dyno'd as a lab rat, and they havent recommended anything bigger, highest flo isnt always the name of the game, there is pulse, pressure and heat to be dealt with-isnt always that simple when you consider the sciences behind it all

[SpeedmasterBRZ]

^^^

I agree and disagree with you Gmooker. 2.5 would be perfect for supercharger; but, on a turbo setup the more free flowing the exhaust the less heat and back pressure post turbo will be produced the better. Even at lower boost levels. Yes 2.5 is good to 400hp but not the most ideal.

Most turbo sixes I have built I actually used 3.5 to 4 depending on power level. Made huge differance over 3.

You are correct on the header.

It all depends on the goals for the car and longevity of the motor or lack there of.lol.

[HighLife]

Originally Posted by gmookher

any quality mandrel 2.5" is plenty of tubing and able to retain mid range torque better than going to 3", so unless youre building a pure race car that will spend a short life living at 10psi, you wont benefit 3" piping, its not a turbo 6, its a small displacement 4...

While you may prove one can make a few more HP on a dyno, tuning for driveability in real world gets more a compromise

the header is still what it is, and removing the 1st cat will both add sound and power if thats what you seek, before spending on 3" cat or headerback, buy a header, if you want more kick in the pants

I have gone with a Perrin headerback and am waiting on Borla EL I managed to sneak a pre order in for..and my car is at Vortech being tested and dyno'd as a lab rat, and they havent recommended anything bigger, highest flo isnt always the name of the game, there is pulse, pressure and heat to be dealt with-isnt always that simple when you consider the sciences behind it all

Reasonable.

I don't know of you should go with headers if you are going to install a turbo kit since it might come with its custom headers.

As for 2.5" Vs 3", more flow, I guess, is always good for turbos.

I miss the clear options I had in my Evo 9 but again we'll have to wait some more for more data and product to come about.

[Tansey86]

I dont think it has anything to do with the displacement of the engine. Whether its a rotary turbo or a turbo mustang id be putting a 3" exhaust on my turbo car either way. Its about backpressure, turbos(unlike N/A) dont want any of it. Id go 3" as soon as that turbo is on.

[eljefe]

dont worry about intake as youll likely be doing custom charge piping or buying a kit, either of which wont be compatible with your NA intake pipe.

If youre going turbo then i wouldnt do your exhaust just yet either, 3 inch catback will sound great with your turbo setup but not with NA... it will likely be loud and poppy with a decrease in torque due to less backpressure. not to mention you dont yet know how its going to match up to your downpipe. You may end up doing a full custom exhaust once your mani and turbo are mounted up.

Honestly i would just go ahead and beef up your clutch and any other drivetrain parts youll be upgrading, and thats it unless youre planning on tearing down your motor and doing forged internals, aftermarket bearings, arp studs, or anything else like that.

[HighLife]

Looks like the best thing to do now OS just chill and wait.

[TyperRspec789]

I don't think this car will ever have a true 3" headerback exhaust. I just installed my 2.5" overpipe and it's honestly a tight fit. If someone actually comes up with a useable 3" overpipe it will probably interfere with the steering rack. The stock overpipe actually has heatshields attached to it, so I'm sure the 2.5" pipe without shields is making something hotter than it's supposed to be.

Back to the main topic, I believe a 2.5" exhaust will suffice for lower boost applications like the one I'm planning (AVO turbo @ 10psi with e85). But for 10+psi, 3" might be necessary.

When I get my kit, I will be adapting it to the Injen intake with a MAF tube.

[gmookher]

Originally Posted by TyperRspec789

I'm planning (AVO turbo @ 10psi with e85). But for 10+psi, 3" might be necessary.

Not on a DD

[Visconti]

Originally Posted by gmookher

any quality mandrel 2.5" is plenty of tubing and able to retain mid range torque better than going to 3", so unless youre building a pure race car that will spend a short life living at 10psi, you wont benefit 3" piping, its not a turbo 6, its a small displacement 4...

While you may prove one can make a few more HP on a dyno, tuning for driveability in real world gets more a compromise

the header is still what it is, and removing the 1st cat will both add sound and power if thats what you seek, before spending on 3" cat or headerback, buy a header, if you want more kick in the pants

I have gone with a Perrin headerback and am waiting on Borla EL I managed to sneak a pre order in for..and my car is at Vortech being tested and dyno'd as a lab rat, and they havent recommended anything bigger, highest flo isnt always the name of the game, there is pulse, pressure and heat to be dealt with-isnt always that simple when you consider the sciences behind it all

still?
yikes