Rob72

Never have seen a 30 HP gain. 20 tops. I've seen the torque loss around 20 also. On a GT you will only go faster in in 1/4 is if you launch at around 6k. That means drag radials at the least. Springs/dampers that allow better weight transfer compliment that. Stock clutch isn't going to hold up long also. A new differential cover with load bolts is recommended also.

In other words to get real word gains it's not just a $400 add on.

SSKILLER5.0

The torque loss is 20. Peak hp gains were overall hp gain is about 20. However peak numbers in the high rpm range are more like 40. I don't totally agree with the 6000 launch. Tough to keep it off the rev limiter from their. If u want the boss I would go full exhaust first to counter the low torque effects.

allenmaty

I remember reading somewhere the valve train in the GT 5.0 is stable up to 7300rpm, bets are off above that.

Rob72

So you're running faster times at the track with the Boss intake verse the stock plenum, no other mods and not launching around 6k?

zachcrosen

Torque loss down low is in the 20 range up to about 5500-6000 and then it starts building peak numbers all the way up to 7500. It will peak around 30-40 RWHP more due to being able to run all the way up to 7500 where the stock manifold starts dropping off after 6000-6500.

With the increased rev limit, I can now stay in 4th thru the timing lights and dont lose speed/time due to the extra shift in the 1/4. I don't know what my trap speed is as that wasnt working the last time I ran at the local strip.

To combat the torque loss down low, just swap out gears at the same time to a 3.73 or better yet, a 4.10!!

Rob72

5500 is around where the torque and power curves cross/separate for both plenums in favor of the Boss. That is why a person with the the Boss intake and no ported heads launch around 6k to get a faster et.

Bmr4life

All data I've seen shows higher track times (slower) with just the Boss intake. You will need supporting mods to make up for the loss in TQ.