Hey guys hope you can help. I am ready for new exhaust on my 67 its got a 327 which is a bit more than stock nothing fancy but it can hold its own. My question is what exhaust to buy. I want an nice open sound, i have got a descent lope to it and i would like to bring that out. Would three inch pipes help me out with the open sound sound I want or is 3 inch to much and what about back pressure, should I be conserned aobut that. And if ya'll have any ideas on what type of mufflers and what series it would be greatly appreciated, sound bytes to if possible, sorry if I am asking to much. Also remember that I want to be heard, but I do not want to end up sounding like a F$$D Mustang. Thanks in advance .

Ryan

does anyone have any ideas


Ryan

FWIW, I think 2.25 or 2.5 would be plenty big enough. You will lose some bottom end if you get too big on the pipes. As far as sounding good, it's hard to beat a Flowmaster 40 series. And don't worry, you won't sound like a Mustang.

Jeff

I just put a 3 inch kit with some dynomax mufflers on a 68 chevelle. I am only running a zz4, and did probably lose some bottem end torque, but it sounds great. I used the straight thru race welded mufflers, and they sound bad ass, and are a different sound then flowmaster. If you ever plan on doing a motor swap in your car, a Big Block for example, you won't have to change your exhaust, if you go with a 3 inch system. But it is really up to what you want. It all depends on your future plans.. Hope that helps.

Hey guys I appreciate your help. As far as bottem end power are we talking about a significant amount, or will I hardly be able to tell. As far as the 40 series go I like those I got on flowmaster's website and liked what I heard but what about the super 40 they seem to be a bit more "open" sounding than the 40's just looking for ya'lls opinion. And i like the 3 inch system becuase i might go for a bigger setup engine wise in the future not SOON but i would like to have the option I just dont want to screw myself over now with my engine and the 3 inch system. Thanks again and hopefully some more folks will give me their words of wisdom.

Ryan

When I bought my 67, she had 2 inch with turbo mufflers, I went with 2 1/2 inch and Imco mufflers and it now sounds way better!!

Brett

2 1/4 exhaust and some free flowing mufflers will be perfect for your car. You want to maintain some back pressure and low end torque with your 327. Bigger is not always better unless you have a very radical cam and you are interested for high RPM power. You want to tune your exhaust for the RPMs that you use the most.

I installed 2 1/2 exhaust with "X" and hemi super turbo mufflers on my Chevelle (small block 400). It sounds great and my car pulls like crazy.

Theo.

Pypes or flowmaster, unless your going to go custom

I run 2.5 with the 40 series and I've recieved nothing but compliments. I took my grandmother for a ride in it and she freaked and had to pull her hearing aid out (resonance). It just can't be beat.

The best part I think, about my exhaust is the setup... I run headers to 2.5 pipes with an H pipe, mufflers, and it all turns down about 8 inches in front of the rear axle. I like the clean look on the back and it definately opens the system up so it can breathe. Its also a lot of fun stirring up dust when idling on the dirt or sitting on some leaves. Just my 2 cents.

hey guys thanks for all the replies, i have just one more question, have ya'll ever heard that when you go to the race track to uncap your headers(no mufflers) because you will gain a little bit extra power. I think they say this because there is no exhaust to restrict you, can this same reasoning be applied to getting a 3 inch system, since they are bigger pipes should'nt i get around the same power if not more than if i went with the 2.5. Or is all this juist a bunch of garbage. Thanks again guys i really appreciate it.

Ryan

I love my 2.5 Flowmaster pipes. I'm running Hooker Areochamber mufflers.. They are the size/shape of the Flowmaster, but about 2/3 the price. Fairly quite running down the road. Roars when you get on it.

Ryan,
There are a lot of factors that come into play when you chose an exhaust. 1 First, you need to look at your driving style. Are you hittin' the track each weekend or mostly street cruising? The exhaust system not only flows, but also resonates. What this means is that at a certain RPM, the exhaust is not just flowing down the pipe but also pulsing. And depending on header primary length and size, and down pipe size, the flow will change at different RPMs as the pulses resonate in the pipe. Including a H or X pipe helps to even out the resonances between the two side of the engine and can help a little in power. The resonance helps with scavenging and it can make a mild engine really fun to drive because the torque is building in the lower RPMs. For torque to happen at lower RPM, the exhaust flow needs to stay fast in order to actually "suck" the incoming air/fuel mixture into the combustion chamber. If you slow down that flow speed,(like with a big exhaust system) you will have to wait until the engine is spinning a lot faster before your get your torque. Depending on engine size and overall breathing efficiency, the exhaust system needs to be matched to the engine for the type of torque and horsepower curve you want. A big 3" system on a mild small block will not pull much at all at low RPM, but can wake up nicely at the top end if you're running high flow heads, big cam and a single plane manifold. But this could be annoying on the street.
I would think that a good 2 1/2" with 1 5/8" long primary headers would work well. Mufflers are a matter of taste... the Series 40's are certainly good for that "I'm here.. deal with it" sound. If you want the most rumble, dump before the rear end and keep all pipe diameters the same from collector to tail pipe.