Magnaflow cat back exhaust question
#8
#12
That looks good. I guess most cat back exhausts have a free flow muffler. The reason I really don't want to go to a muffler shop is because they crush bend their piping and I want to be able to remove it if I have to. Usually they cut the flange off of the stock piping and weld onto it so its one long pipe and the only way to get it off is to cut it. I may just get the Magnaflow cat back system and if I notice a major loss in low end torque then I will replace the muffler with something else and keep the mandrel bend piping.
#13
Originally Posted by fddriver02
Did you notice any loss of low end torque?
Rich
#18
#20
Technicaly... The less the back pressure the easier the flow in/out of the cylinder as the valves open & close.
The problem is that this does not make for the best **torque**
You need a little back pressure for maximum torque at a given rpm. Since nobodys exhaust will be perfect 100% of the time we have a good balance of low end backpressure and top end back pressure.
On my 06 FX4.. I saw *no appreciable* amount of power increase or loss as measured by my calibrated butt-o-meter. This tells me a after cat for the 4.0L really has no effect for power increases.
One thing it does give is the *potential* for top end power. Wether or not I'm actually getting it I don't know because I have'nt measured it.
Also IMO, the exhaust tone was totally worth it.
Rich
The problem is that this does not make for the best **torque**
You need a little back pressure for maximum torque at a given rpm. Since nobodys exhaust will be perfect 100% of the time we have a good balance of low end backpressure and top end back pressure.
On my 06 FX4.. I saw *no appreciable* amount of power increase or loss as measured by my calibrated butt-o-meter. This tells me a after cat for the 4.0L really has no effect for power increases.
One thing it does give is the *potential* for top end power. Wether or not I'm actually getting it I don't know because I have'nt measured it.
Also IMO, the exhaust tone was totally worth it.
Rich
Last edited by wydopnthrtl; 10-30-2007 at 11:38 AM.
#22
#23
Originally Posted by greygooseranger
I wonder what headers would do on my pretty much stock rig....
Someone on here (not long ago) put them on his stock 4.0L Stock cats I think too.. He reported more bottom and mid range.
I'll go out on a limb here... in my experiences with stock motored street cars the cats are the limiters. Usually going to high flow cats (or being evil and gutting them) will give a power increase. Only once did I see a bottom end loss by removing them. And even at that it was'nt much at all. Gained me 3 tenths in the 1/8th though.
Rich
#24