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@Rednexus Can you elaborate on Long-tube headers are easier to install? I have the dreaded "tick" & would like to do DTs, but I from what I've read I thought both short & long tube would be equally terrible to install. Are the long tube easier just because you don't have to weld the cats back on (like with the short tubes)?Given the difficulty and labor/expense of manifold replacement, I would not chance it on non-OEM manifolds. The OEM manifolds have a lot of cracking issues as-is that were never addressed - so even a new pair will also crack just like the originals. Dorman parts are OK but usually lower quality than OEM, so you may end up with cracks even sooner in the future. Also the OEM Lexus cats are high-quality and will have more precious metals and better environmental performance than aftermarket cats.
The best bet for this repair is to get a set of Doug Thorley short-tube headers and retain your existing OEM cats. The Dough Thorley headers will give you more power and are not subject to cracking like manifolds. Long-tube headers are easier to install and provide even more power but you lose the front cats, so they may be a no-go if you live in an area with emissions inspections.
Usually is subjective term and that wait time is still a crap shoot in my opinion, theres nothing on the website that guarantees 2-3 week turn around for delivery, had there been I may have reconsidered this purchase.DT wait times are usually 2-3 weeks tops, have bought them twice in the last year.
My GX470 is very quiet.I’ve owned 4 GX470s ranging from 80k to 290k original miles, all of them had leaking exhaust manifolds. It’s not loud, it’s a very subtle ticking noise, sometimes it goes away after a short warmup.
I would wager most people don’t even notice it on their own trucks.
Makes your GX sound like an old crappy american v8.
Without the leak a stock GX is quiet as a mouse, you can barely hear the engine running.
Sorry I totally missed your post! I think we were on vacation, and I just now noticed this due to DRANGED replying .@Rednexus Can you elaborate on Long-tube headers are easier to install? I have the dreaded "tick" & would like to do DTs, but I from what I've read I thought both short & long tube would be equally terrible to install. Are the long tube easier just because you don't have to weld the cats back on (like with the short tubes)?
Thanks!
The LTs retain the OEM secondary cats in the midpipe, and only omit the primary cats. So the GX would not be catless. But it is not possible to add cats to the LT headers themselves - they are comprised of multiple tubes that come together just before the collector and start of the midpipe.@Rednexus and @jiggletits:
DT headers seems, to me, like the smartest "performance mod" for our engines.
- Is it possible to weld OEM cats to the DT LT's?
- Does anyone know how much performance gain should be expected with the DT ST's?
thx guys....
LT terminate in a flange which bolts up to stock flange upstream of 2nd cat. To retain 1st cats to LT headers (or welding a flange to cat and bolting up to LT) you'll end up doing custom downstream of header replacing the Y-pipe to get 2 cats on each side before the Y-junction going into the single exhaust. At that point, might as well go full custom with twin pipes, each side has its 2 cats, resonator and muffler, or aftermarket with appropriate cats and muffler(s).@Rednexus and @jiggletits:
DT headers seems, to me, like the smartest "performance mod" for our engines.
- Is it possible to weld OEM cats to the DT LT's?
- Does anyone know how much performance gain should be expected with the DT ST's?
thx guys....