Hi Guy! Unfortunitely, no power gains from any of this....
Here's some reading for you...
Flowmaster, H-pipe, headers, CAI...
Here's a link to a "Real Test" that verifies....on a 700+ hp engine......no gain or loss of with or without the cats! and provides some real insight on headers, etc.
http://www.kennebell.net/KBWebsite/Common/pdfs/header_cat_xpipe_exhaust_tests.pdf
The H-Pipe really plays very little in terms of performance- nor does it reduce backpressure in any way- it was originally introduced to equalize the pressure between the two pipes, inducing a scavenging effect, but in reality, while it did improve some things a little, all it really, the only thing it really was effective at was to reduce noise- nothing more. An X-pipe will increase HP if it is installed at the "area of confusion"- but that area is identified by painting a small strip on the exhaust pipes about 1/2 way between the engine and the axle- the area of confusion will cause increased heat and blister/burn the paint at that location- that's where the H or X pipe would be installed- and eliminates the air flow disturbance by sending alternating pulses in that location which acts as a "vacuum" if you will to push & scavenge the remaining and incoming air out....but, with just about all the universal type systems, unless the H/X is installed in the area of confusion for your car, there are little to no power gains.
With regards to the CAI...
In 2012, Mustang Chief Engineer Dave Pericak specifically stated that the use of an aftermarket CAI will do nothing to gain any power.
because for one, your crr already has a CAI from the factory, whose CFM capability already exceeds that of the engines stock design.
The formula which is used by every air filter manufacturer in the world to determine the CFM for flat panel filters is...
Flat Panel CM= Length x Width x 6
So, take your relatively stock engine, calc the max CFM based upon mfg specs; calc the max CFM the oem filter will flow....now show me how sticking a filter that will flow 900 CFM will increase the performance of an engine that can only suck in a max of 480 cfm and has an oem filter that will flow 500 (like on the 5.4 F150)? Unfortunitely, it just isn't happening.
Testand Corporation conducted an ISO standards test on automotive air filters which can be viewed at this link: Duramax Air Filter Testing * - Diesel Bombers.
“After only 24 minutes the K&N had accumulated 221gms of dirt but passed 7.0gms. Compared to the AC, the K&N “plugged up” nearly 3 times faster, passed 18 times more dirt and captured 37% less dirt.”
With regards to the rest, compared to the oem manifolds, there is at best, 5-8 hp gain at redline with aftermarket headers on your stock engine.....and the TB...your oem TB already provides more flow than the current engine can suck in....there will be no gain on a stock engine.
Aftermarket cams are always a real good performance adder but expensive, because it's not just installing the cam, but installing the valvetrain (springs, etc.) that the cam needs to work the way it's suppose to...plus it either needs to be compatible with the ECM or you are now into custom programming....to go with a cam, valvetrain kit & programming....that is near $1k. The underdrive pulley on a daily driver can cause issues.....it really as far as power gains goes, only is benefitial at high RPMs.....and in a street vehicle, if you wait to develop your power until 4000+ rpm....the race is already over. Underdrive pulleys also can cause charging system issues especially if you do a lot of street (vs highway) driving....the slower crankshaft speed turns the generator slower which todays engines literally run off the charging system (as compared to the old stuff - 1970's and back)...and you can find yourself with a dead/sub charged battery as a result...but this can be addressed if you buy a complete pulley system that is designed to offset this.
The really best bang for the $, is really a gear change...nothing too radical.....if you have 3.25's you can go to 3.75's and the car will feel much stronger (as if you had done some very expensive mods)...but should cost closer to the $500 range.
