Hey guys I'm a newbie on the site but I've hadn't 4runner since 2006. I saw an old thread regarding a lack of aftermarket parts for the 05-09 v8 vvti motors.
I thought I could shed some light on my experiences and hopefully help with some solutions.
I also experienced the notorious cracked headers and after talking with dealerships I decided against a factory replacement and tried out sourcing after market headers. I tow every summer about 5000 pounds for about a 1500 mile round trip.. so I'd also like more power.
I found that the JBA headers made for the Tundra WILL fit with a few easy mods (as long as your handy with tools and a welder).
On the driver side, the forward most exhaust tube for the header needs to be cut right after the bend and replumbed over top of the other tubes. Additionally the tube needs to be dimpled inwards to clear the steering linkage. On the passenger side the only mid is tacking the oil dip stick to the header. At the same time I cut out the extra two cats. Why have four when you only need the first two!? A dyno test proved that the mod only gained me about 11hp, but my low end torque increased drastically by almost 30 pound feet!!!
The job took me a weekend and the headers cost about $500, but the improvements were well worth it.
So, the mystery regarding aftermarket headers are resolved. Get the JBA headers for the 4.7L tundra and modify them.
I'm typing on my IPhone so I don't have any pics to post this second, but I will add some ASAP, that way you can see how the mod looks.
Cheers!
I thought I could shed some light on my experiences and hopefully help with some solutions.
I also experienced the notorious cracked headers and after talking with dealerships I decided against a factory replacement and tried out sourcing after market headers. I tow every summer about 5000 pounds for about a 1500 mile round trip.. so I'd also like more power.
I found that the JBA headers made for the Tundra WILL fit with a few easy mods (as long as your handy with tools and a welder).
On the driver side, the forward most exhaust tube for the header needs to be cut right after the bend and replumbed over top of the other tubes. Additionally the tube needs to be dimpled inwards to clear the steering linkage. On the passenger side the only mid is tacking the oil dip stick to the header. At the same time I cut out the extra two cats. Why have four when you only need the first two!? A dyno test proved that the mod only gained me about 11hp, but my low end torque increased drastically by almost 30 pound feet!!!
The job took me a weekend and the headers cost about $500, but the improvements were well worth it.
So, the mystery regarding aftermarket headers are resolved. Get the JBA headers for the 4.7L tundra and modify them.
I'm typing on my IPhone so I don't have any pics to post this second, but I will add some ASAP, that way you can see how the mod looks.
Cheers!
