How good is the EMI thunder exhaust and how much HP is to much?

They are build pretty well. They can run a moderate amount of larger power thru them. I wouldnt use them for a some applications, or applications with huge power. It really depends on what you are looking to run thru them & what kind of cam set up you will run...

If you need a price or have other questions on them, feel free to give me a call during the week..

Jamie / Lakeside Restorations 570-639-2628

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i have run some 540's with excess of 680hp,no problems! work well, and i hav sold lots of sets as well with no issues..EMI rate's them to 700 hp with the ss rised's..

Did you really ask how much HP is to much?

Not in the way your taking it . I built my motor to 675 hp with a 100 hp shot of nos this winter . Now are those exhaust going to work. NEVER TO MUCH HP NEVER HAVE ENOUGH MONEY!!!!!

I think with any over 550 HP you would see gains from header exhaust. I do know I have seen those on some pretty big engines though however that doesn't mean there not sacrificing HP either. Raylar has done extensive testing with exhaust on the dyno. Maybe he'll see this and help out.

i have a set of emi i ran them for about 5 hours on my supercharge application about 950 hp and no problem I got a set of CMI and did not notice any difference only like 2 MPH faster.

This is EXACTLY what I have done...ran the EMI's for close to a year on a 700+HP 540 with no issues, short risers and no reversion. Spent almost $6000.00 on a custom set of CMI's and got a 2 mph (gps) increase in speed...sure as Hell not worth the 3K per mile an hour...and something that I will never do again. Put a Blower Shop supercharger on the motor and saw a massive increase...way more than my boat was capable of handling, but I did not run the EMI's with the supercharger to compare, so I cant help you there. You can get the EMI's straight from them and save alot of money by not going thru the middle guy. Also look on E-Bay as there are always advertisers there selling them for a very reasonable price.

Do you think they make any more HP than stock gill.

glm will make more hp then gill