Youre gonna pick up a bunch with those. Very nice move right there budd.

I knew you were lying about the 'no more mod' part

 

I seem to make that lie after every mod I do.

 

You have to remember that not every mod is going to show an improvement if it wasn't a bottleneck or a true improvement over the stock part it replaced. You may see an improvement with long tube headers but how much depends on if the shorty headers were a restriction. After the header swap your next step will probably need to be heads, Good heads will compliment all the improvements you already made.

 

Some of these mods are gonna be seen at the upper end of the rev range.

 

Me too. I just say more mods even if I don't know what mods to do.

 

going to 1 7/8 kooks really helped my ls6 in the bottom and mid range over 1 3/4 mac mids.

Roller rockers help mid range alot to.

A ewp(with belt mod) helos errywhere. A crank scraper has more benefits at high rpm.

A good ported fast seems to favor top end power for his rpm range.

 

Do you mean roller rockers that have a greater ratio than stock?

 

Yes but even the same ratio helps some. The stock rockers are a variable ratio. They start at 1.52 and ramp up to 1.7. A standard 1.7 will open the valve faster and a 1.8 even more fast and higher. Being you have a ls2 the cam is slightly lacking anyway a set of 1.8 rockers would do well on it. Especially since a ls2 already has ls6 valve springs. The added lift is covered.

 

Care to explain this further? Where are you seeing those numbers?

A lot of it has to do with setting up proper Rocker Arm Geometry And Valvetrain Alignment.

 

Unless you are getting them for under 500$ I wouldn't wast my time on the kooks. Id get the Speed Engineering 1 7/8 headers and x-pipe and use the saved money else-wear.

 

Too late, already bought the Kooks.

And I already have an x-pipe.

 

Another thing if you are doing the flex fuel on the GTO you can get everything dirt cheap on Amazon for like 100$ install is pretty simple you can find write ups on ls1gto and Facebook (Search how to Flex fuel the 05/06 GTO in under 60 seconds) the tuner will have to enable flex fuel and tune afterwards but installing it yourself will save money. The gains wont be to drastic for you maybe 10hp at best I personally would ditch the 85mm Maf and switch over to a card style LS3 maf in a 100mm tube and swap the ls3 TB for a NW102 Tb as that duespeed intake is a 92mm if i recall.

 

Considered the flex fuel thing for a while. But don't forget about the cost of upgrading the injectors and adding to the tune, that makes the process somewhat less attractive for the potential gains. It gets worse if you also upgrade the fuel pump at the same time. Kinda the same deal for the NW102, is the juice worth the squeeze for my set up? Like you said, that would really only benefit if a number of other mods came along.

 

It may not be worth it now but in the long run say Heads Cam you will have everything in place to optimize the setup its really about your long term goals for the car. Honestly with the cost of the LSA swap being so cheap for the GTO its almost pointless now and days not to go boosted. The boost district kit is pretty cheap relative to the power you would make over heads cam, I wish i would have went that rout instead of trying to push the NA envelope.

 

I've often considered the idea of going with the Magnuson kit, but price has always kept me from going there. Never heard of the Boost District kit, looks interesting and is much more attainable. Not sure I'm in love with the idea of hacking up my hood though.

 

http://www.superchevy.com/how-to/141...ce-rocker-arms

 

Get the low pro motor mounts problem solved.

 

You could have done the ebay china 102 over buying that ls3 tb. For a bolt-on car you MIGHT have enough in the stock injectors on e85, but you can always go up to 42lb ls3 injectors for cheap. I'm don't think you'd need to do a fuel pump while staying bolt-ons. I would do the ls3 card maf as well, its also more tunable.

 

I has a chinky 102. Woks good after a little massaging.

 

I've heard too many horror stories about trying to tune one of those cheapies. May not happen all the time, but with my luck it would. LS3 TB was inexpensive and a bolt on and forget it proposition. I'll bet it will be more long-term reliable than the cheapie 102.