Hello,
i am an old man of 80 + who has a firebird ws6,6peed manuel,v8,2002. just changed the exhaust system to a flowmaster. There was a big difference in the walk. My question is what else can I do to get a little more horsepower out without taking the engine apart?
thanks

 

long tube headers and tune

 

Thanks for the tips. Can you give tips on make, design that fits, within a not too high price level. That said, I'm new to these engines.
ATTENTION; the system must have catalyst because Swedish regulation.

 

Basically need to get more air in and more air out by replacing some of those things that restrict air flow. You said you didn't want to take it apart but what about bolt ons?

Here's some things you can do and you'll need a tune.

Airbox mod and a better lid
LS2 intake and 90mm throttle body
Longtube headers with high flow cats

Of course a camshaft with more duration and lift to increase air flow is a another way to get more air into the engine but now you're removing the fans, radiator, water pump, etc. You can swap a cam without removing the lifters. I have two 3/8" diameter sticks that are about two feet long that I've used for this that works well. You just have to remove the rocker arms and pushrods then roll the engine over by hand to raise the lifters so you can get the sticks through there. I've even done it with link bar lifters but the plastic trays in the stock engine hold them up so you can get the sticks through more easily.

 

Thanks,
The headers must have good catalyst because the Swedish traffic regulation. Every year you have to Swedish car testing to get the car aproved for driving in traffic.
Ok. I must think about that. looks very expensive.

 

Smog police changes everything. Unless you find someone here that is VERY familiar with Swedish smog testing and rules, you'll have to search out someone in your country. I can't recommend anything since I haven't a clue what your country's rules are. Having an E.O. on headers like Kooks, etc., is only valid here in the U.S. Sorry I can't be more helpful....

 

Do the catalyst(s) need to be in the original location? If so, only shorty headers will work, and only IF they are allowed in Sweden.
A less restrictive air intake will help, but not a lot. And that's only if they're allowed in the first place.
We need to know exactly what is, and what is not allowed by Swedish law.

 

Thank you, I understand. The problem is that in Sweden there are very few people who know and can. Mostly living at great distances. Hard to find.

 

I would change the final drive ratio to make the car a bit quicker, urethane suspension bushings to make it handle better..... all with the existing power and not have an impact on emissions

 

IWe can close. I understand that the regulations in Sweden regarding exhaust emissions make it impossible to change the car's basic design. The EGR and catalytic converters measure emissions and if the values ​​are too high, the vehicle is rejected.

 

. 12 PSI Manifold Pressure. (drops mic).
.

 

www.ls1howto.com is a great website from a long time ago that gives a step by step process how to do just about anything.

You already have the good LS6 intake manifold (2001-2002 Fbody LS1 cars have it). The throttlebody won't do a ton...
If you can change the camshaft and valve springs plus then you need to get it tuned that is the best performance change.
Pretty easy to add 50hp with just the camshaft change with long tube headers (add catalytic convertors to those).
Most Fbodies like yours with long tube headers, a healthy cam, LS6 intake, tune will make 390-400rwhp which is 450-460hp flywheel. After that you need ported heads which will add another 30-40hp flywheel.

The big question is what is your budget? $1K, $3K $5K?

 

There’s good power to be found in the tune alone. Don’t overlook the tune, ESPECIALLY a in a stock car.

 

25% underdrive pulley will pass smog and will not require a tune.
And super easy installation.

 

One question, my intake is an Ls6 while the block is Ls1. How did it happen?