By the way, the tips on the AFE system are welded to the tubing, same as the stock, but cleaner. Not to say who's is best or better sounding because I don't know. But AFE was under 600 and Magnaflow is over 800 and their tips have to be clamped on. Good luck and have fun shopping for your new toys, lol!

 

The stock exhaust uses the same qualtiy 409 stainless steel as AFE.

I think the 3" inlet with 3" dual outlets it too much flow. This could have adverse effects on power in the lower RPMs. The 3" inlet with 2.5" dual outlets is more appropriate for our applications, IMHO.

 

No offense, but there is no comparison between the two, and that's your application, not mine, lol! I guess I should get some pics up of my stock funkies and my AFE's, lol. My truck sounds purdy and it launches like a rocket, there is no low end stall, it's better now. With that being said, do you think these guys running open headers are loosing power on the low end, lol? More exhaust flow is one of the major ingredients to HP, geez these aren't rice burners needing 1 and 1/2" exhaust, lol. Second, ask any professional engine builder, Gary Stanton or someone if you won't take my word for it. I don't mean to undermine your intelligence, but headers don't do anybody a damn bit of good unless they are open or are vented through high flow exhaust, and the more the merrier. Flow numbers is what exhaust is all about, and matching mods to your engine specs. And speaking on your behalf, not all 3" tubing flows better than 2 1/2", we leave that for the makers to argue or flow benches. Think about it, everyones advertisements are all about the best flow and less restriction. You guys with the stock exhaust, no offense, but get under the back of your truck and check out those nasty welds to your tips and mufflers. That's why I didn't go to the dealer and get one, there is no comparison in quality to any high performance after market system. They are not even mandrel bent!

 

Calm down Radio. Take a few deep breaths, it’s not that serious.

If you have a 2009, then you replaced 409 stainless steel with 409 stainless steel.

Open header applications are for maximum power in racing situations where the RPMs will stay in the upper power band. They aren’t meant for everyday driving with stop and go driving, where the RPMs stay in the lower power band. In everyday driving you want an exhaust that has the highest exhaust velocity across the entire power band. It’s about finding a balance between high and low power. A very free flowing exhaust will provide good high end power, but suffer down low, whereas a more restrictive exhaust will provide good low end power, but suffer up top. Exhaust companies try to find a compromise that will maximize the upper and lower power band.

Under your logic, the exhaust companies would all use 4 or 5 inch piping because that will flow better than 2.5 or 3 inch piping.

I never brought up any “rice burners” in my post, but some those “rice burners” use exhaust piping just as big and even bigger, so I’m not sure what point you’re making.

The AFE exhaust is a fine system and I was in no way attacking it. I just wonder if the dual 3 inch piping is a bit too much. We won’t really know for sure unless we have some dynos and can analyze the power curve, so any further debating is pointless.

/rant

 

FYI Stock dual should be a 3" in and 2 (2 1/2) out. I got a magnaflow muff installed and they measured the pipes first. But you can see a diff in size without measuring.

 

Agreed, but for those of us that already have the stock setup, it would not be cost effective to change out with a new system for better welds to increase flow a tad bit. Overall, the stock dual is better than going to a chop shop muffer place that will bend the crap out of the pipes and not have the smooth bends for less restriction.

I understand if you have a single going to dual, I would spend the cash on a good system as well.

 

True dual EX. is not on the hemi, Y pipe into mufler with two outlets, nothing realy special to brag abought.

Looks wise the stock ex system looks great, But I would remove the y pipe, stock mufler, run two free flowing muflers and use the factery tips, I don't where the 02 sensors are on the 09 hemi, chances are good that if you remove the y pipe, new o2 sensors will have to be taped into the new pipes off the manifold.

 

These trucks were designed with a certain amout of back pressure for rpm ranges to make hp/tq - we all know that.

I had an 09 4x2 with single ex, i paid 300 for a true dual 2x magnaflow system. sounded great, but had a loss of power and not an increase. it never punched the same the day i changed it out.

i wanted a 4x4, so i got another 09. this time around, i only changed the muffler out with a magnaflow to reduce restriction and a better tone. still punches like new if not better...

 

Thats correct on yours, but mine was single exhaust, 3 in and 3 out

 

Bobba Booey, no hard feelings here bud. My exhaust works great with my truck, but if I'd had the factory duals I wouldn't have gotten these. I have a RCSWB with 392's on 31" tires that bring my gear ratio a bit lower than 410's on 33's. So my truck launches great and even burns the tires from a 10 to 15 mph roll and into second. And that's not in towhaul mode. I did that the other day and they burn to easy and I'll never do it again. I can't afford the tuner right now much less new tires. I like the sound of the stock duals, I just don't like how they are made so I bought these. But I have no low end loss of power with this exhaust, further more, AFE assured me of more power and they were right. I'll try and get some pics up this weekend to show you guys the old and new.