I am going to try to set up some time to get back on the dyno and pull the y off and just run open headers to see how much that exhaust is killing me. And while I am at it I want to run the race gas and play with the timing. It is a no brainer that it will make more with higher octane and more timing. I am really concerned with how much the exhaust is effecting my setup. 5-10 hp I am not going to care but if it is 5-10 and pulls to 7k then that is a big deal. And if it is 20-30 more and pulls to 7k then I know where my problem is.

 

Run the open headers, but alteast put a 10" extension pipe behind them.

 

^^^I can do that. What is the benifit of doing that?

 

^ Power and it helps not to kill th O2 sensors.

 

They are right but I would at least a 12-18 inch extension to do it right. We have tested this many a times on the dyno and 12-18 is the sweet spot!

 

Thanks s. I will do that. I am assuming 3"ID pipe for the Kooks"s headers??

 

Sounds like you have a stout setup ready to breath. Building bad *** engines is all about ballance. Off road y pipes might be great for those little 346's but you have a real healthy 427! The fast might be gagging it a little but not as bad as the y. Also with that compression ratio, and running just 93. Put some race gas in her and crank up that timing. I think you will see 20 plus hp with timing alone going to 28*, and I really have no clue the hp you would gain getting rid of that Y pipe. Let us know how it goes!!! Get that 600rwhp!!!

 

Plan on true duals this weekend if all goes well.

 

sweet that will upppp your power a lot and add some rpm hp up top!!!

 

^^^That is what I am thinking

 

cooool

 

any updates?

 

We are going to be trying a 96 mm throttle body and some 3" true duals with some Dynamax bullets. It is supposed to rain for the next couple of days but stay tuned we are working on somethings. I will put down the number we are all looking for here soon. If not I am going to burn this thing. LOL

 

you are going to test the tb by itself and then add the exhaust?

 

^^^NO but we will run it with the new exhaust first and then swap the t body so we will still be able to see the different gains.

 

Good thread. There is 20-30 rwhp in the exhaust. What MAF is on it?

FWIW, the open headers will make power, but an X setup will pick up the midrange substantially.

 

its a freggin race car run open exhaust!!! haha. Jk run some cut outs or some true duals like you said. As for the intake fast is just showing their new fast 102 setup. It just might add some more power to your setup, test 'er out!!! And keep us posted good thread.
-Shane

 

It has an LPE 100mm MAF. I don't see where going to SD is going to make any difference at all.

 

No, its not nick. The 100 is not a restriction. The 85mm at that power level is only 7-9.

 

Put the true duals on it today. The way we had to run it there is no x or h pipe it is 2 straight pipes to the bullets right at the bumper.