The benefits of the newer intake are better throttle response (with the bigger TB) and better flow so you can make power easier if you have other supporting mods (cams, heads, etc.). If you're reworking your donor harness you would need injector pigtails ($20 on ebay) or injector adapters ($50-60) and the x-link ($235) so around $300 give or take on top of what you get the intake setup for and you get a pretty decent performance bump. I picked up my complete intake and TB for $140 and was already planning on getting an aftermarket harness so there really wasn't any extra cost beyond that. That’s why the TBSS intake swap is such a good bang for the buck upgrade. With that said Texas Speed is a great place to work with and has some really reasonable head & cam packages as well as gasket & bolt kits for whatever you plan on doing.
#Tbss intake manifold plus#
Of course once you pull the heads off then you need new head bolts and gaskets, plus it’s best to replace the lifters while they’re off, then depending on the engine’s mileage you may want to replace the oil pump, and depending on what cam shaft you get you’ll need better springs and pushrods, and you can see how things start to snow ball lol. A lot of companies will custom grind you a cam shaft to match the heads and whatever vehicle you’ll be putting the engine in for the same price as their other camshafts. If you have more money in the budget then doing a port & polish on your heads and milling them a little would be the best overall performance bump but you’d need to do a camshaft swap to really take advantage of them. The drop-in cam shafts are made specifically for these truck engines and can be ran with the cheap LS6 valve springs and stock push rods. If you’re only looking to do one thing on the relatively cheaper end then I would look at doing a drop-in cam swap from Brian Tooley Racing or Cam Motion. Really just depends on what all you want to do to the engine and what your budget is.
Lots of information on this can be found online by searching for “TBSS intake swap” but here are a couple of threads I bookmarked back when I was reading up on it:
Plus if you’re swapping the engine in to an older truck you basically have a blank slate and can do whatever works best/is easiest for your situation. The newer intake also has a return-less style fuel rail so if your truck isn’t set up that way you’ll have to figure out something there but there's a ton of different ways to do that and none are all that complicated. Or if you're going with an aftermarket harness just request the newer style plug when ordering it. You can pick up some plug/harness adapters or new plugs with pigtails to splice in to your existing harness pretty cheap. I talked to BP Automotive and they said they could make me a harness that would work with the 87mm TB that came with my intake but I would need the 99-02 TAC module as well which wasn’t a problem because I already had both style TAC modules laying around my garage… Some of the aftermarket harness makers might also be able to build that in to your custom harness if you ask for it. There’s a cheaper $50 harness from Caspers (and a few others) that will let you use the 90mm LS2 throttle body but you also need a 99-02 TAC module and both of those can be pricey. For your 03 engine you’ll most likely need an X-Link harness adapter from Torquerush that runs $235 but is basically plug and play. If you’re running a DBW TB you’ll need some sort of the harness adapter since the newer TB has different electronics. Most people aren’t a big fan of the adapter plate option because you wind up limiting the flow of the new intake with the smaller TB. If your truck is set up for a cable TB you’ll either need to buy a new 90mm 4 bolt cable operated TB or a 3 bolt to 4 bolt TB adapter plate to re-use your existing 78mm TB. I was able to find one complete with injectors, rails, TB, etc for only $140 and since I was already doing a new cam and swapping on some 243's I figured why not? Here are a couple of things to look out for if you’re thinking about doing it:
#Tbss intake manifold full#
FYI though the TBSS and other Gen IV truck TB's are 87mm, only the cars got a full 90mm but the couple of times I saw someone try to swap to a 90mm TB there was virtually no gain.Īs far as whether or not it's worth it, that's up to you to decide. They flow as well or better than the LS6 intakes that everyone goes nuts for but they’re a lot cheaper and have longer intake runners to maximize low end torque. That’s actually a fairly common swap on other performance oriented forums and it’s supposed to be worth an extra 20-30+ HP on the 6.0 engines depending on who’s dyno sheet you’re looking at.
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