true duals over the axle, what size piping can you go with?
is 3 inch too big? And if you have any pics thanks I am looking to go with duals over the axle then 2 mufflers and exits in the stock location on my T/A like this and will it have a interior drone?? i want loud but some what quiet inside the car on the interstate

 

The bullets are going to drone bad in the high gear 1600-1900 RPM range. Don't expect to carry on a conversation unless you shift to a lower gear and put the RPM 2000 or above. Might wanna look at the magnaflow 4" round mufflers in this application. They sound better to me and control the drone better.

 

i went 2.5" piping over the axle. its pretty tight over the drivers side axle. if you want a real loud exhaust, you have to deal with drone

 

Mine:









Used Magnaflow 4" round bullets. Drone is minimal, but it is there. I don't have a problem carrying on a conversation. You'd have to go with a bigger muffler to get rid of it, and at that point, you might start running into space issues trying to squeeze them in there.

Oh, and it is 2.5" piping after the X...I don't think you'll fit 3" piping unless you go over each side of the car.

 

BMR make PHB relocation kit so you can run 3 inch duals over the axle. http://www.bmrfabrication.com/F-body...tm#panhardrods
Have you looked at under the axle setups?

 

They sure do say that, but if you'll look at my pics, you'll see that two 3" pipes ain't gonna fit without some serious banging.

 

Thats why under the axle set ups seem so good to me right now. Put some flanges on the the end sections so you can unbolt them if you need too and you would be good to go. I havent ever seen one in person but all the threads on here dont say anything about losing ground clearence.

 

You can do it that way, but it isn't as clean of a setup IMO. You'd really have to ask yourself why you wanted 3" duals all the way back...it leaves you a lot of room to grow, but most people don't really need it.

 

Godd point, When does 2.5 inch piping become restrictive? Around 400 hp right?

 

If you can find a good, solid, well-documented, well-researched answer to that question, you let me know. I think it all depends on the design. Mine was done with all mandrel bends, and that seems to help. Going from my 3" catted Y and a Hooker (that flows well for everyone) to that setup above, I went from 331/347 to 340/356, and the A/F was a little off on the duals run.

 

Is your TD setup catted, cant really tell form the pics.

 

Negative...before was with the Magnaflow hi-flow cats, after was without. Whether the gains came from that or not, I have no idea.

 

man looks good I always loved the center mounted tips like that to bad i couldn't put on a T/A. probably wouldn't look right

 

Man everytime I see your TD setup I , that has to be the CLEANEST TD setup I've seen!

 

Lane has said that 3" dual reduced to 2.5" after the X will support up to about 460hp.

 

Thanks man...as long as I keep the damn thing painted

 

I had mine done. it has cats then 2.5 all the way back over axle on both sides, then I have 2 chambers in the rear looks just like a GMMG, so the right side pipe goes over axle into chamber and out the left of the car, opposite for other side, i can hear music and talk on the phone, but its still sounds great, and has none of that drone noticed with bullits or turn-downs.

 

do u have any pics that sounds exactly like what ive been thinking of doing.

btw meentss02 u have some serious suspension on that car and still a 10 bolt??? do u know something no one else does--looks like its a 6 speed even...

 

Required flow for the exhaust can be calculated by the engine volume, heads etc. or 2.2 cfm per open pipe HP, so a 500 hp engine needs 1100 CFM. I don't know what the CFM is for a 2 1/2 pipe but I think for most if not all of our applications dual 2 1/2's are plenty.

 

https://ls1tech.com/forums/generation-iii-external-engine/319961-dual-3in-over-axle-muffs-rear-bumper.html

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