Magnum 5.9/Doug's headers--what diameter exhaust pipe do you reccomend?

[MRGTX]

Stock "Magnum 300" with dual plane Mopar intake manifold, Demon 650, Doug's headers...looking at heads/cam next year.

I'm having a custom system with an H-pipe being bent up now...What diameter exhaust system would be best for street (and occasional strip) use?

I assume that "bigger is better" when it comes to motors like this...so forgive me if this is another dumbass question...but I massively appreciate the expertise of this community and my budget only allows me to do this once.

Thanks!!
-Mike

 

[gtsdude]

2 1/2 should be plenty IMO

 

[MRGTX]

2 1/2 should be plenty IMO

Thanks, GTS. This is more or less what I assumed...but is there any advantage to going larger if it's possible?

 

[RustyRatRod]

Whatever the collector is.

 

[gtsdude]

3inch would give you room for future upgrades in power, or even 3 inch to the mufflers And 2 1/2 tail pipes. I checked around and two shops said they wouldn't do 3 inch tail pipes cause it wouldn't fit. Guess they didn't check summit, they sell 3 inch mandrel bent that includes tail pipes. My 340 dart slows down .3 in the 1/4 with the exhaust on, 2 1/2 from headers to choke master mufflers and factory 2 1/4? I think tail pipes, they were on the car when I got it.

 

[496 polara]

It takes a mighty healthy small block to need 3" pipes.I would say 2.5 mandrel bent pipes with a less restrictive muffler.

 

[rumblefish360]

It takes a mighty healthy small block to need 3" pipes.I would say 2.5 mandrel bent pipes with a less restrictive muffler.

This, ^^^^^^^^

 

[mderoy340]

2.5 full mandrel bent summit kit on my car. No drone and uncap the cutouts, 6 wingnuts at the track.

 

[64physhy]

2.5 full mandrel bent summit kit on my car. No drone and uncap the cutouts, 6 wingnuts at the track.

This is what I was running when I had the Doug's Headers on. The Summit DIY kit with X-pipe and cutouts, exiting from the mufflers, heating the axle grease.

 

[MRGTX]

So 2.5" mandrel-bent system is on with some generic turbo mufflers (light and cheap)

It sounds tremendous.

Thanks, guys!

 

[64physhy]

So 2.5" mandrel-bent system is on with some generic turbo mufflers (light and cheap)

It sounds tremendous.

Thanks, guys!

Did you put in an X-pipe?

 

[TrailBeast]

This is what I was running when I had the Doug's Headers on. The Summit DIY kit with X-pipe and cutouts, exiting from the mufflers, heating the axle grease.

Old racing trick?

 

[64physhy]

Old racing trick?

Just trying to keep it simple. At the track, I used the cutouts, so it went out the sides, and I rarely drive it on the street.