Comments on: After Market Toyota Tundra Exhaust Systems

By: SB

SB — Sun, 03 Mar 2013 04:27:36 +0000

2011 tundra 5.7/installed Flowmaster 50 series/great sound with no drone like the 40 series/You can literally make music with the Flowmaster 50 series

By: Rod

Rod — Thu, 06 Dec 2012 06:44:45 +0000

Jason,
I have been reading a lot of your replies this evening and wondered if you would give me your 2 cents on my 2004 tundra double cab 4.7. with k&n. and magnaflow muffler. 255,000 miles. Runs great except for check engine light intermittent in the last year.
I am losing mpg. Down to 13 mpg. I see others on this thread that are getting 19!

Recently, I had the code tested and it showed the cats no operating efficiently. I would like to remove the cats. (I do not to have emissions in my state) However, I am worried about losing power and making the situation worse.

I want a high performance cat, if possible, but I cannot narrow it down.
I would appreciate any info.

Also, how can you tell if an O2 sensor is bad? Can you clean it?

Thanks in advance.

By: derek

derek — Fri, 30 Nov 2012 05:36:26 +0000

hey guys im looking for a good system for my 08 4.7 tundra i want the sound but dont want to lose power in my truck i have heard the flow masters 40 r 50 is good any suggestion

By: Max

Max — Tue, 20 Nov 2012 00:18:53 +0000

Anybody know much about the exhaust from Diamond Eye? like sound and drone at hwy speeds? Their website donst give much info?

By: Brian

Brian — Tue, 16 Oct 2012 03:44:22 +0000

are you able to add an x pipe to the borla cat back?

By: Jason (Admin)

Jason (Admin) — Tue, 02 Oct 2012 15:17:14 +0000

Rick – The long and short of it is that some exhaust systems effectively reduce low-end torque to create top-end power. This is because the vehicle was designed with a certain amount of back-pressure in mind at the lower RPMs – if you change that pressure value, you reduce exhaust system scavenging and you see a little loss. Now keep in mind this is a small loss – maybe 10lb-ft of torque, maybe even less – but you feel it a bit more at the bottom end. The extra 10-20lb-ft of torque you’re gaining at the top end as a result of this change is great, but it’s harder to feel.

Drone is a problem with any after-market system I think, especially if you want something quiet. Only it is more livable with some systems than others (Borla is generally good, only it’s subjective). If you really want a drone-free system, the TRD exhaust is probably the best.

Finally, I completely concur with the fact that the Tundra’s stock exhaust system is solid. We’ve done quite a bit of exhaust system testing and you have to get really loud before you see a substantial increase in power.

By: Rick

Rick — Mon, 01 Oct 2012 20:14:18 +0000

PS: The Tundra exhaust tubing look likes it was bent in a custom shop, i’m not exaggerating, total quality, clean radiuses. The tailpipe seems like 3″. Darn good parts. I never looked under there, just assumed it was inferior. And it weighs NOTHING, very light, I can pick up entire system with one hand. Warning to guys who want to dump money, slow down. Bolt on the supercharger first and see if it runs ok! I can’t see this exhaust hindering anything as Toyota’s claims of power are from a stock, single! I am posting pics tomorrow when I download them to be fair to everyone.

-Rick

By: Rick

Rick — Mon, 01 Oct 2012 20:03:47 +0000

Jason, I recently had a custom dual exhaust installed on my ’12 CrewMax. The shop installed dual Magnaflow, stainless mufflers and 2.5″ cat back pipe and 2.5″ tailpipes. I specified ultra quiet mufflers as I want to hear my superchager’s whine, not a raspy, annoying exhaust. I was assured of same. Only when I took the truck on the highway did I notice the drone at 1800 – 2100 rpm which is constant at 65-70 (See “Max’s” blog above) and I can’t help but feel my bottom end was LOST. I have to get into the throttle to get my truck up and going. I didn’t feel that with my stock exhaust. The system looks great but I am not happy at all. My transmission seems to be shifting more now to find power, even downshifting when It hadn’t before. After all this planning, i’m disgusted.

As I looked at the stock exhaust on the floor (I saved it), to Toyota’s credit, it looks VERY robust. Anyone thinking a single exhaust is inferior, I’d say it was planned and TUNED. The tailpipe appears to be more than 2.5″ and the muffler looks stainless. A quality setup.

I only paid @$500 for the system installed, a good price. But I am thinking I want to go back to my single, quiet, stock system or maybe have these mufflers taken off. They were nicely welded too, the job was so clean. Damn.

Any thoughts? I did read about some who lost torque when they ‘upgraded’ to a new exhaust. I’m not alone out here. Is there a quiet, high-flow muffler that will restore my bottom end? Thanks.

Rick

By: Jason (Admin)

Jason (Admin) — Wed, 12 Sep 2012 14:29:51 +0000

Dennis – It shouldn’t be a problem, and you can always bend one of the pipes if need be.

By: Jason (Admin)

Jason (Admin) — Wed, 12 Sep 2012 14:26:15 +0000

Jim – Typically, exhaust systems don’t make much difference either way when it comes to performance. If you were expecting a noticeable bump in power, you’ll likely be disappointed.

However, when combined with an air intake, you’ll definitely notice something. Toss in a Unichip tuner and you’ll really see a difference.