Would this exhaust pipe flow enough for my setup?

Saw this on another thread, and figured I might be able to fit this around my Caltracs and finally get my side exit exhaust that I always liked.

It is called 3" oval, but basic mathematics says it doesn't have the area of 3" circle, and probably not as much as the current 2-1/2" that I currently have.

Anyone have any feedback about how constricting this would be from my flowmasters out to the side exits?

Maybe it is available in 4" and then it might be feasible? It never even dawned on me that they made this stuff.

 

...yes...

 

I just need to squeeze past those subframe connectors and Caltracs...I lost a lot of my side-exit real estate when I installed those.

 

would rethinking your exit point be an option...

...this is mine w/caltracs...

 

You need some constriction, it helps with bottom end.

 

The oval is kinda like a rounded rectangle. The Spintech 3" Oval pipe has dimensions 2.25" X 3.5". You can see that the pipe is just a rectangle with a half-circle on each end. You find the area by breaking it up (image not to scale, but you get the idea). It is not far from 3" round, but much farther from 2.5" round.

3" circle area ~ 7.065 sq.in.
3" oval area ~ 6.505 sq.in.
2.5" circle area ~ 4.906 sq.in.

 

For some reason, I have an emotional aversion to pipes exiting behind the wheels. I don't know why, but it kinda irks me. No offense to anyone who has them exiting behind the wheels, "for each his own".

Despite my knowledge that it would be an optimal location to exit, for performance, sound, and smell, I just don't like to see pipes exiting behind the wheels. Just behind the wheels and side exit is better than out the back, in my opinion, but I REALLY like the look of exiting in front of the rear wheels,

You all know me well enough to know that I HAVE to do it the hard way every time...

 

Ok, merc. Thanks for the details. I assumed the 3" dimension was the length of the oval. I assumed incorrectly. It is actually more like an average of the width and height. Or maybe more like it started as a 3" round and was pressed down to a 2.25x3.5.

In which case, the 2.5 oval would probably be just about right for me.

(truthfully, when I put the straight out tips on my mufflers last time, I ended up with 2.25" and not 2.5" because I could not find a 2.5-2.5 coupler)

 

I hope you're not planning on putting the pipe between the subframe and connectors. If you were, then that's a bad idea.

 

No, It will have to go under the connector.

That is why I wanted flattened tubing, for ground clearance between the connector and ground.

 

Ok, just checkin

 

Always have liked the look your going for. Should be cool! Are you trying to get the connector piece of 2.5" inside diameter on each end?

 

I was. For some reason, the stores I went to only had 2.5-2.25, so I used those.

 

the only issue I can see with that exit strategy is that the lowered level.. or plane.. of the pipe will be considerably lower than the bottom of the rocker.

Only way to tighten it up that I know of would be to curve upwards after dipping under the connector?.. whick look too euro to me on these types of cars. Or running a megaphone style tip to fill the gap between the top of the pipe and the bottom of the rocker.

Got any decent side shots so we can see where you'll end up with exit after running below the connector?

PS. and unless you have a larger displacement motor.. all you'll end up with from too large a pipe is slightly softer bottom end(which comes from loss in velocity and has absolutely nothing to do with "backpressure for improving bottom end").. and an overly loud exhaust out of the larger 3" pipes. Megaphones will only make it worse.

 

Looks like I have 6" at the connector, and 5" at the caltracs.

I don't think I can do it, because if I try it at the connector, it might be too close to the door-line to be legal. I think the pipe has to exit behind the door crack.

Besides, look where the back end of my muffler is located. I would have to make an S to come forward to where I want it to exit.