'03 4runner exhaust solutions

[expatoz]

Magnaflow was much better for a DD. Not so much the brand but the size - going from 22" down to 13" makes quite a difference. I have heard that Flowmaster mufflers do drone more. Ive heard many happy people with Magnaflow.

[expatoz]

By the way, it appears as if the muffler in the second picture is hanging low (even lower than the frame). In fact it's higher. It won't get hit in a hurry. They turned the muffler on its side to gain even more clearance.

[puulboy]

My concerns with your set up is the clearance and exhaust exit. I agree with the previous poster about how low the bottom of the flowmaster sits. I know, I would rip that off on a rock. I did a high clearance exhaust, after bashing my stock muffler, that was probably higher than your flowmaster.
Turn it sideways and try to exit the exhaust more toward the rear or side. You will be getting carbon mo, in your truck, at slow speeds or idol, for sure.
Here is what I did with my FJ. It looks like the 4 runner has a similar set up. I added a magnaflow and had it angled up, then the tailpipe was added that is even with the frame rail in height and right before the rear bumper frame rail. I don't get any fumes in my truck with this set up. I went to a local muffler shop with the idea how I wanted it and the guy bent it up perfect. The whole system was 175 bucks that include the magnaflow. I decided to use 3", just because of the bends. I wheel all the time and have never hit it since. It looks exactly like it was installed.

thanks
Don

[expatoz]

My flowmaster is approx 1 1/4" higher than my Magnaflow was. No way its getting ripped off unless I somehow drag the crossmembers over boulders first - in which case I have problems with the driveshaft too! Its really tucked up - just doesnt look like it in the picture. Its higher than the frame rail.

Oh - and no carbon monoxide problems. In fact being far away from the rear hatch, and air flow patterns off the back of the 4R (or any straight back vehicle for that matter) you get more gas problems with a cut off just behind the tailgate because its more condensed there than the dispersed gas from under the truck before the axle.

[puulboy]

You are exiting exhaust before your rear dif . It seems that exhaust could just hang around under your truck, while at idle. But hey, I was just making an observation.

[Good Times]

I have a similar setup to what Mark has and to date it hasn't been an issue w/ the exhaust just "hanging" around. Then again I don't drive it every day like Mark so I wouldn't know what kind of permanent impact it'd have on the daily driving experience. I'm guessing it's negligible though.

I would have extended mine all the way back to what you have on your FJC but I've got a fuel tank right where the spare tire used to be so I really don't have an option of doing that anymore

[Okie81]

I had a similar exhaust setup that kicked straight down too. I never noticed any CO problems, but it did tend to blow up a lot of dust on dirt roads. Any issues with that expatoz?

[rando6289]

well, finally decided to go with a 40 series Flowmaster. Sounds amazing! most likely because it is a V8. also very pleased with the more responsiveness when you put the peddle down!

thanks for all the suggestions!