I just installed my headers this weekend it was a mission I did test pipes at the same time. I did notice a nice gain

 

If you're going to get headers, you should definately get some HFC/Test pipes & an exhaust.

I haven't heard of people losing low-end power. From what I hear, TP/HFC with a tune should yield better low-end & mid-end power.

.

 

I just took my headers off in favour of the TT. I had HF Cats and Stillen exhaust and I assure you, there was no loss of power at any RPM.

Which leaves me with my Stillen stainless headers... Any takers?

 

I just put Crawford headers and HFC's on and it improved midrange and upper RPM. It made a noticeable difference. I also got Osiris and that made a big improvement, too.

Most people that say headers aren't worth it, don't have them.

 

Don't do it. You're right, I don't have them .......... but I did. Why did you take headers off to go TT??? You put back on....... ???? It's all about opening up a restrictive flow (velocity) to the right amount. Too much is no good, not enough sucks too. Me........ with this car....... I've had the best results with HFC and a good Catback. Your money do as you see fit. Just my $.03

 

You have to take the headers off to put the TT on because it replaces the stock exhaust manifold.

As long as you have equal capacity into and out of the engine, all is good. If you increase the air in but do not provide a way out for the extra air on the exhaust side, you will not be getting maximum benefit from your mods. The G has quite a few restrictions on both sides in its stock form.