RandyQuickXJ

Ok...i am interested...i have a 98 Cherokee and the owner before me had put a throttle body spacer on it, and i was just kind of wondering is it a noticeable difference to put a bored throttle body on it...i am definitely down for some more power...and i don't care about fuel economy because i drive a damn lifted jeep i wouldn't have bought it if i wanted good gas mileage haha i know that everyone seems to go toward the 62mm throttle body and i am just wondering if its worth it...and also i do have neon injectors, and a borla exhaust with a magnaflow highflow cat

JerrytheJeep

First off, get rid of the tb spacer, its worth its own weight in jelly beans and gives absolutely no noticeable gains. I also have yet to see a dyno sheet from a customer that shows an increase in anything. That being said, a bored throttle body will give you a gain. I hear you need to bore the manifold or the plate below it as well, but don't quote me on that. Best of luck to ya.

RandyQuickXJ

well I am not going to take it off until i get a bored tb for it probably...and i have seen that the opening on the manifold side is 62mm which is the same of the bottom side of the bored tb i am just wondering if it is a noticeable gain before i go and spend some money to figure out it isn't any different

AridzonaXJ93

Before you go thinking this is going to be a big "seat of the pants" noticeable mod it's not. You'll gain a few ponies tops, but it won't be obvious. I'd say boring the throttle body has to be done with several other mods to see a true gain, like new aftermarket header & exaust system and a 99+ intake would go great with a bored TB, but not really worth it by itself.

Gee oh Dee

If you do have a high flow cat and muffler, you'll see more gain than most do.

Your only as efficient as your smallest bottle neck. In this case it would seem to be the TB.

And if you've already got the TB spacer just leave it. Its not going to hurt. Not gonna help, really, but it's not hurting at this point.

Search and destroy

How does a highflow cat work really I see it for the ones filled but I looked down mine and it's completely hollow Im not sure if you can get any higher flowing than that.

Gee oh Dee

We do not allow the discussion of hollowing out cats. I'm sure the previous owner made that illegal modification, but you are correct, there isn't much more high flow than that.

We have a vendor here, mudfrog, that sells actual hih flow cats. Flows almost as unrestricted as a straight pipe with the cleaning effects of a cat.

RandyQuickXJ

Well I was just wondering if its even worth it, and my jeep has neon injectors and exhaust and I'm going to get a header here pretty soon too because my exhaust manifold is cracked but its all 2.5 inch exhaust with a magnaflow hi-flow cat and a borla muffler it has just about everything you can do but a bored tb so that's why I was wondering

Gee oh Dee

Yes, it is indeed worth it, moreso for you than most.

98XJ40K

With the other mods, the Bored TB is worth it. Look up a member on here named thexjfiles, he sells the bored tb and gives you credit if you send him your old one. Very happy with mine with a 99+ intake manifold, cowl snorkel, headers, and neon injectors. A new exhaust is in the near future to complete everything.

evan00xj

be careful with bored tb. they can crack or eventually not seal correctly causing erratic idle. i say the best on the market is the 62mm from jeepers and creepers. its solid aluminum. that paired with a flat air deck is good. stay away from BBK

jx2991

Do it! You won't regret it. With your other mods, you should notice a difference.
Removing any bottleneck increases flow. Flow = performance.