Manta Cat back V6 4.0l

[redboss]

Hi All,

I have an 05+ Dual Cab SR5 4.0L V6 Auto.

I would like to hear opinions and hopefully reviews on a mantapro cat back system for my rig. I am after fuel economy and performance. I don't want my car to sound droney and terrible.

Link to the exhaust i was researching: http://www.mantapro.com.au/product/toyo ... etrol-ute/

[HK1837]

Not sure you will get much improvement with either economy or performance with a cat back system. The exhaust manifolds and engine pipes plus cats are probably the most restrictive parts.

Also not sure what you can do for any V6 - they always sound terrible. I just live with mine, it has a Beaudesert exhaust system from extractors back. Still sounds awful though, only saving grace is the whine of the supercharger!

Nothing I have done has really improved economy though, primarily as I never drive for economy.

[redboss]

Thanks for the feedback, similar to what i been hearing round. I may put my money towards something more beneficial then!

I mean the V6 has the power but would be nice to have that extra bit when towing the camper and overtaking.

[HK1837]

Supercharging will fix that. Exhaust alone even if done right only really improves top end power and torque in large amounts. Low end torque and power really doesn’t change dramatically. In fact the wrong exhaust will actually reduce low rpm torque.
Send me a PM with your email and when i’m able i’ll send you my dyno curves and you’ll see what I mean.

[Jimmy_Lux08]

[quote="HK1837"]Supercharging will fix that. Exhaust alone even if done right only really improves top end power and torque in large amounts. Low end torque and power really doesn’t change dramatically. In fact the wrong exhaust will actually reduce low rpm torque.

HK how do you think the Beaudesert exhaust system will go on a NA V6? Would you lose low end torque without a supercharger?

[HK1837]

Send me a pm. I dyno tested mine before and after exhaust fitment. I also fitted a piggy back ECU with the exhaust. I have dyno curves on the same plot for before and after.

[HK1837]

Actually go to my shed profile, curves are there with peak figures.

First curve is standard vs exhaust+XEDE, both on 98 octane.

Second curve is exhaust+XEDE on 98 vs E10. XEDE has two tunes for the two fuels.

Beaudesert spent a fair bit of development on that system. The problem with this engine is most exhausts lose low rpm torque. Their exhaust makes significant gains but doesn’t lose low rpm torque like many others. But I hate the sound of mine, V6’s with extractors are not pleasant to listen to. I’d investigate the Tacoma exhaust manifold path. Do some searching on this forum. From memory they still give OK power and torque gains but without the wet fart noises.

[Jimmy_Lux08]

Thanks for the info HK just had a look and seems to be good gains across the rev range. Would you say the XEDE is mandatory with this system to make it work well?

I’ve only just bought a V6 a couple months ago and got to say I’m loving it after driving the D4D for years, especially the punch off the line! Having had a fair read on most of the V6 threads still active on here and couldn’t really find a definitive answer on the Beaudesert exhaust (until I found yours) so it’s good to hear that it’s 1 of the only ones that doesn’t lose low rpm torque. Plus the added bonus they’re less than 100k away.

Reading through most of Gulfstreams research he did on the Tacoma headers is interesting but thinking I’ll get a TRD cai setup with this exhaust.

[HK1837]

I think you need the XEDE plus the O2 sensor relocation pipes or you get errors. It also allows you to run fuel maps for 98 and 95/E10.

I have a TRD cold air intake but not yet fitted.

I’m telling you though, a V6 with extractors and reasonable flow sounds horrid. Not quite as bad as that stupid off the throttle diesel sound I hear around a lot today but almost as bad.

[Jimmy_Lux08]

Definitely will get the O2 sensors from what I’ve read.

If you get around to fitting the cai it would be interesting to hear if it’s good! How much was it to get it over here tax and freight wise?

[HK1837]

I’d have to look up the purchase cost of the intake.

You’ll find bugger all difference with the exhaust without the XEDE I think. My tune on it initially was a postage tune, it came with the two tunes and I fitted it when I fitted the exhaust. You’d be better off going to Chiptorque once it’s fitted and getting it properly tuned. I kept getting O2 sensor errors until I fitted the extenders too. The tune in the XEDE now though was done at Chiptorque after the blower was fitted.

[Hutchyman80]

Mine had a custom 3” exhaust with extractors on it when I bought it and still ran the standard computer. But the CEL was always on until I did the sensor thing. Once I fitted the TRD CAI it made a noticeable difference in power. I guess the intake is the next most restrictive part after the headers and exhaust. I don’t care what it sounds like, I have a stereo to drown it out, but it does drone. I still think the 3” is a bit to big, if I ever have to replace it will probably go the Beaudesert Exhaust route, if think they’re 2.75”.

[HK1837]

Yes, they are 2.75”. Whenever I hear mine it makes me think of Bogans in V6 Commodores or Holden utes. When you hear it in a car park or concrete canyon it sounds even more horrid, at least the supercharger noise is audible too. But that V6 engine note is almost as bad as the sound of a baby crying on a long haul flight, or the horrid sounds diesels make. Or other stuff like fingernails on a blackboard.

[taresk]

These engines only sound good if you have equal length front to back, equal length headers, going into equal length Y pipe, through a heavy muffler, gives them a nice rumble that doesn't sound like a Commodore, but is expensive to do.

Beaudesert actually have two systems for the V6, a 2.5" for NA engines and a 2.75" one for supercharged engines