Do you guys have emissions inspections in your state? In Maryland, we have to get our emissions tested every 2 years. The last time I had to get the truck checked, they coulnd't get the pipe up to my exhaust because I cut the pipe off shortly after the muffler. So anyway, I had to clamp an extension pipe to mine so the guys could hook the testing pipe up to mine.

Anyway... If you have a turndown immediately after the muffler, I don't see how they could get emissions testing equipment to the pipe...

 

Well, I've been told otherwise. I don't have any proof to back it up, except that if you ask Tim at DOA about it, he'll say something that'll agree with what I'm saying. Toyota engineers are smart guys, so I think they took a lot of things into consideration when designing the crossover... most importantly, cylinder firing order.

I think by the time the exhaust from the right manifold makes it over to the left, it's already gone all the way to the front of the left manifold, and when the next cylinder fires on the left side head, that exhaust is pushing the right side exhaust out. So, theoretically, the only flaw being not having a big enough downpipe to rid the manifold of all of both exhausts at the same time. I think that's why Tim recommended just upgrading to a bigger downpipe, exhaust pipes, and high flow cat and muffler.

I wish I had known before I bought my headers, because I would have tried that out first to see what the results would have been. I probably would have still gotten headers because I believe they do provide more power than Tim's setup, but I've just always been curious to exactly how much more power we're talking about.