None all a spark plug dose is make a fire to start the boom you do need to change them or they will get carb billed up in them and they won't work
by changing your horse power voult
You have to remove the front wheels to gain access to the spark plugs.
You rock the engine forward to gain access to the rear plugs.
intake about 8-12 hp complete exhaust 30-40 performance chip (how ever it is adjusted) spark plugs and wires will be to small of a gain to notice. i have the same car trust me!
You need to remove the coil on plugs Each plug has it's own coil fitted you need to remove these to gain access to the spark plugs which are located under the coils.
On the 2.3L and 3.0L engines, remove the top plastic engine cover and remove the rubber spark plug wires (4 of them for the 2.3L and 6 of them for the 3.0L) to gain access to the spark plugs.
There's a plastic cover on the top of the engine, between the timing covers. You need to remove the screws securing this cover, to gain access to the spark plugs. A long 10 mm AF box wrench, will be needed to extract and refit the spark plugs.
you can add a throttle body spacer, add a msd kit and platinum spark plugs and wires, cold air intake, you could gain about 15-20 more hp.
no all you have to do is remove the block covers that cover the coil packs and remove the 8mm bolts and remove the coil packs to gain access to the spark plugs
The spark plugs are located, 3 on each side of the engine right along the inside of the wheel well. They are recessed inside the valve cover and require the individual ignition coils to be removed to gain access to the plugs.
on th etop of the motor remove the plastic cover. it will give you access to the coils and plugs. Using a 10mm socket, remove the engine cover. All 4 plugs are in the center of the block. Two are really easy to find, the other two need to be removed after you remove the cover on top. You will need a 10mm socket to gain access to them. Don't forget your extender when changing the plugs.
the cold air intake might gain you 5 hp and the spark plugs and wires probably almost nothing honestly. i don't know about the performance chip, those eBay performance chips claim some hp but you never know unless you dyno it. i wouldn't put any of those chips on my car.